Impact Resonance deals X damage divided as you choose among any number of target creatures, where X is the greatest amount of damage dealt by a source to a permanent or player this turn.
You determine the value for X and announce how damage will be divided as you cast Impact Resonance. Each chosen target must receive at least 1 damage. Once the value of X is determined, it won’t change, even if a source deals a greater amount of damage before Impact Resonance resolves. (Most of the time, the value of X in an effect would be determined only as the spell resolves. However, the rules state that if damage needs to be “divided,” that information is checked as the spell is put on the stack.)
2014-11-07
wotc
Impact Resonance looks at the entire turn to see the greatest amount of damage dealt from a single source to a single permanent or player. For example, if the only damage dealt during the turn was Earthquake, which dealt 5 damage to each of four creatures and two players, then X is 5.
2014-11-07
wotc
If Impact Resonance has multiple targets, and some, but not all, of them become illegal before Impact Resonance resolves, Impact Resonance will still deal damage to the remaining legal targets according to the original damage division.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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