MTG Haste & Flash Rules: Complete Timing Guide
Haste and flash are the two keyword abilities that control when things happen in Magic: The Gathering — and timing questions are where new players get confused faster than anywhere else in the game.
Can a creature that just entered the battlefield block? Can you attack the turn you cast something? What exactly can you do during your opponent's turn? Can you respond to a spell with a creature? Every one of these questions comes down to understanding these two abilities and the rule they interact with: summoning sickness.
This guide covers both abilities in full — what they do, what they do not do, and resolved examples for every common timing situation.
This is the second article in our complete series on MTG keyword abilities, following our deathtouch guide. You can find the full series at the end of this article.
What Is Summoning Sickness? (The Rule Behind Everything)
Before haste makes any sense, you need to understand the rule it exists to break.
Summoning sickness is the informal name for this restriction: a creature cannot attack, and cannot use activated abilities that include the tap or untap symbol in their cost, unless it has been under your control continuously since the beginning of your most recent turn.
In plain terms: the turn a creature enters the battlefield under your control, it cannot attack and cannot use its tap abilities. It has to wait until your next turn.
Here is what most new players get wrong — summoning sickness does not prevent:
- Blocking. A creature can block the turn it enters the battlefield. Always. No haste required.
- Activated abilities without a tap or untap symbol in the cost. A creature can use those abilities immediately, even if it entered this turn. If the ability includes the tap symbol, summoning sickness stops it unless the creature has haste.
- Being affected by spells or abilities. Summoning sickness is not a shield of any kind.
One more detail that matters in Commander: summoning sickness applies whenever a creature comes under your control — not just when it enters the battlefield. If you steal an opponent's creature with a control-changing effect, it has summoning sickness for you that turn even though it has been on the battlefield for ages.
What Is Haste in MTG?
Haste is the ability that switches summoning sickness off. From the Comprehensive Rules (702.10): a creature with haste can attack, and can use its activated abilities with tap or untap costs, even if it has not been under its controller's control since the beginning of their most recent turn.
In practical terms: a creature with haste can attack the turn it enters the battlefield, and can use its tap abilities immediately.
What Haste Does NOT Do
This is where the confusion lives, so let us be precise:
- Haste does not untap a creature. If a creature is tapped, giving it haste changes nothing about that.
- Haste does not make a creature harder to block. Haste creatures are blocked exactly like any other creature.
- Haste does not bypass other attack restrictions. A creature with defender still cannot attack, and effects that prevent attacking still apply. Haste only cancels summoning sickness — nothing else.
- Haste is not needed to block. Any untapped creature can block regardless of when it entered the battlefield.
Resolved Example — The Stolen Creature
You take control of an opponent's creature with a "gain control until end of turn" effect that also grants haste.
Without the haste part, the stolen creature could not attack — it has summoning sickness for you because it has not been under your control since your turn began. This is exactly why every "threaten"-style effect grants haste along with control: the haste is what makes the stolen creature able to attack that turn.
What Is Flash in MTG?
Flash answers a completely different question. Haste is about what a creature can do once it is on the battlefield. Flash is about when you are allowed to cast the spell in the first place.
From the Comprehensive Rules (702.8): a spell with flash may be cast any time its controller could cast an instant.
Normally, most non-instant spells — creatures, sorceries, enchantments, artifacts, planeswalkers, and battles — can only be cast during your own main phase, when the stack is empty. Flash removes that timing restriction. A creature with flash can be cast:
- During your opponent's turn
- During combat — yours or anyone else's
- In response to another spell or ability on the stack
- At the end of an opponent's turn, just before your own
Why Flash Is So Powerful
Surprise blockers. Your opponent attacks with everything, confident in the maths. After attackers are declared but before blockers are declared, you cast a flash creature — and suddenly their attack falls apart. This is the classic flash play, and it works because the creature can block the turn it enters. Remember: summoning sickness does not prevent blocking.
Holding up interaction. Flash lets you keep mana available for a counterspell or removal, and if your opponent does nothing worth responding to, you cast your flash creature at the end of their turn instead. You never waste a turn. This flexibility is the backbone of every draw-go control strategy in Commander and competitive formats.
Dodging sorcery-speed removal. A creature cast at the end of your opponent's turn is exposed to one less turn cycle of board wipes and sorceries before it can attack on your turn.
Flash + Haste: The Difference Explained Once and For All
The single most common confusion between these two abilities, resolved:
Flash is about casting. Haste is about acting. They are completely independent.
Resolved Example — Flash Without Haste
At the end of your opponent's turn, you cast a creature with flash. Your turn begins. Can it attack?
Yes. The creature has been under your control since the beginning of your most recent turn — your turn started with it already on the battlefield. Summoning sickness does not apply. It attacks normally, no haste needed.
This is the elegant trick of flash creatures: casting them at the end of the turn before yours effectively gives them pseudo-haste, because by the time your turn starts, the summoning sickness window has already passed.
Resolved Example — Flash During Your Own Turn
During your own main phase, you cast a creature with flash. Can it attack this turn?
No — unless it also has haste. Flash changed when you could cast it, but the creature still entered the battlefield this turn. Summoning sickness applies normally. Flash and haste solve different problems.
Instant-Speed Interaction: The Stack and Priority Basics
Flash only matters because of how the stack works, so here is the practical version every player needs.
When any player casts a spell, it does not resolve immediately — it goes on the stack, and every player gets a chance to respond before it resolves. Responses go on top of the stack, and the stack resolves top-down: the last spell cast resolves first.
Instants and anything with flash are what you can cast while another spell is on the stack. This is how counterspells work — and it is exactly what makes cards like Force of Will and Fierce Guardianship so valuable in Commander: both can be cast without paying their mana cost under their conditions, meaning you can interact at instant speed even with all your mana tapped out.
Resolved Example — The Counterspell War
Your opponent casts a game-winning spell. You respond with a counterspell. They respond to your counterspell with Fierce Guardianship, targeting your counterspell.
The stack now has three spells. It resolves top-down: Fierce Guardianship resolves first and counters your counterspell. Your counterspell is gone, so it does nothing. Then the original game-winning spell resolves. The lesson: the last person to respond usually wins the war — which is why experienced players hold their interaction as long as possible.
Resolved Example — Instant-Speed Value at End of Turn
You hold up mana all turn for a counterspell. Your opponent does nothing threatening. At the end of their turn, you cast Vampiric Tutor, putting exactly the card you need on top of your library — then untap and draw it.
This is instant-speed play at its best: your mana was insurance the whole turn, and when the insurance was not needed, it converted into value at the last possible moment. Casting tutors and card selection at the end of the turn before yours is standard practice in Commander precisely because it commits you to nothing until the last moment.
Quick Reference: Haste & Flash Interaction Table
| Situation | Result |
|---|---|
| Creature enters this turn — can it block? | Yes — summoning sickness never prevents blocking |
| Creature enters this turn — can it attack? | Only with haste |
| Creature enters this turn — can it use tap abilities? | Only with haste |
| Creature enters this turn — can it use mana-only abilities? | Yes — summoning sickness only blocks tap/untap costs |
| Flash creature cast at end of opponent's turn — attack on your turn? | Yes — it has been under your control since your turn began |
| Flash creature cast on your own turn — attack this turn? | No — flash is not haste; summoning sickness applies |
| Stolen creature (control changed this turn) — can it attack? | Only if the effect also grants haste |
| Does haste untap a tapped creature? | No — haste only cancels summoning sickness |
| Can haste creatures be blocked normally? | Yes — haste has no effect on blocking |
| Can you cast flash spells in response to other spells? | Yes — any time you could cast an instant |
Why Haste and Flash Matter in Commander
Haste is what makes big finishers actually finish. In a four-player game, a huge creature without haste telegraphs itself for a full turn cycle — three opponents get the chance to remove it before it ever attacks. A finisher with haste (or given haste by another effect) attacks the moment it lands. This "haste tax" is why experienced Commander players value haste enablers so highly in aggressive strategies.
Flash is what separates reactive decks from predictable ones. A Commander player who does everything at sorcery speed shows their whole hand's worth of intentions every turn. A player holding mana with flash threats and instant-speed interaction — Force of Will, Fierce Guardianship, Vampiric Tutor — forces every opponent to play around information they do not have.
You can find these staples and more in our full catalogue, or import your decklist directly with our decklist search tool.
Frequently Asked Questions About Haste and Flash
Can a creature block the turn it enters the battlefield?
Yes, always. Summoning sickness only prevents attacking and using activated abilities with tap or untap costs. Blocking is never affected. This is one of the most commonly misunderstood rules by new players.
Is flash the same as haste?
No. Flash lets you cast a spell at instant speed — any time you could cast an instant. Haste lets a creature attack and use tap abilities the turn it comes under your control. A flash creature cast during your own turn still has summoning sickness. They solve different problems and some powerful creatures have both.
Can a flash creature attack on my turn if I cast it during my opponent's turn?
Yes. Summoning sickness checks whether the creature has been under your control since the beginning of your most recent turn. If you cast it during your opponent's turn, your next turn begins with it already under your control — so it can attack normally without haste.
Does haste let a creature attack through defender or attack restrictions?
No. Haste only cancels summoning sickness. A creature with defender still cannot attack, and any other effect restricting attacks still applies. Haste removes exactly one restriction and nothing else.
Can I use a creature's mana ability the turn it enters?
Yes, if the ability's cost does not include a tap or untap symbol. Summoning sickness only prevents abilities with tap/untap costs. An ability that costs only mana can be used immediately. Note that most mana creatures do have tap costs, which is why they usually cannot produce mana the turn they enter — but that is because of the tap symbol, not a general rule.
If I steal an opponent's creature, can it attack this turn?
Only if the effect that gave you control also grants haste. Summoning sickness applies to any creature that has not been under your control since your turn began — including creatures that have been on the battlefield for many turns under someone else's control. This is why "threaten" effects always include haste in their text.
Can I respond to a haste creature attacking?
Yes. Declaring attackers does not use the stack, so you cannot respond before the creature becomes attacking. However, after attackers are declared, every player gets priority before blockers are declared. At that point, you can cast instant-speed removal on the attacking creature, cast a flash blocker, or use any instant-speed effect. Haste does not make a creature immune to responses; it only lets it attack sooner.
More guides in our keyword abilities series:
- Deathtouch: Rules and Every Interaction Explained
- First Strike, Double Strike & Trample: Combat Damage Explained
- Hexproof, Ward & Shroud: What's the Difference?
- Vigilance, Lifelink, Reach & Defender: Combat Basics
- Flying & Menace: Evasion Abilities Explained
- Indestructible & Protection: The Complete Guide
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