Executioner's Swing

Instant    (CMC:2)

Target creature that dealt damage this turn gets -5/-5 until end of turn.

"The contract specified an appendage for a missed payment. Read the fine print: the head is an appendage."

161 GTC • ENKarl Kopinski

™ & © 1993—2013 Wizards of the Coast

Legal in: Modern,Extended,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Executioner's Swing {W}{B} Instant Target creature that dealt damage this turn gets -5/-5 until end of turn.

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View this MTG card on Gatherer

1/24/2013
You can't choose a creature that hasn't yet dealt damage during the turn as the target of Executioner's Swing, so in most cases it's not possible for Executioner's Swing to reduce the amount of combat damage a creature deals. (If a creature has double strike, you could cast Executioner's Swing after it deals first-strike damage but before it deals regular combat damage.)
1/24/2013
It doesn't matter what the creature dealt damage to or if that damage was combat damage.

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Card Executioner's Swing is not on TCGPlayer.