Warning

Instant

Prevent all combat damage that would be dealt by target attacking creature this turn.

Legality

Format	Legality
1v1 Commander	Legal
Archenemy	Legal
Block Constructed	Legal
Canadian Highlander	Legal
Casual	Legal
Commander / EDH	Legal
Commander: Rule 0	Legal
Custom	Legal
Duel Commander	Legal
Highlander	Legal
Legacy	Legal
Leviathan	Legal
Limited	Legal
Oathbreaker	Legal
Pauper	Legal
Pauper Duel Commander	Legal
Pauper EDH	Legal
Planar Constructed	Legal
Planechase	Legal
Premodern	Legal
Quest Magic	Legal
Tiny Leaders	Legal
Vanguard	Legal
Vintage	Legal

Discussion (1)

berryjon on Advice on Player and Rules

7 years ago

Short answer, you're in the right. You can cast pump spells after blockers are declared, and before damage is allocated.

Long answer: Rule 509 of the Comprehensive rules spells it out, though in a long winded manner.

You declare Attackers.
You and your opponent, in priority order, put triggered abilities on the stack.
You and your opponent, in priority order, can cast spells or activate abilities.
Resolve the stack.

Your opponent declares blockers.
You and your opponent, in priority order, put triggered abilities on the stack.
You and your opponent, in priority order, can cast spells or activate abilities.
Resolve the stack.

Move on to the Combat Damage step.

What this means is that when you declare your attackers, before the opponent decides on blockers, they can do things like cast Bright Reprisal or Warning on one of your attacking creatures. You can also, for example, cast Jump on one of your creatures to give it flying before the opponent can declare a blocker for it.

Then the opponent declares their blockers. After that has been decided, each of you, in priority, can cast spells again. You can cast Giant Growth on your attacking creature here, and they can cast cards like Hold the Line or activate the ability on Angelic Page or General Jarkeld (and he's just a bundle of laughs, let me tell you).

Then, once everything is resolved, is damage dealt.