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Instant    (CMC:1)

Target creature is a flying creature until end of turn.

2E • ENMark Poole

™ & © 1993—1993 Wizards of the Coast

Legal in: Modern,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

10/1/2009
To work as an evasion ability, an attacking creature must already have flying when the declare blockers step begins. Once a creature has become blocked, giving it flying won't change that.