Berserk

Instant    (CMC:1)

Cast Berserk only before the combat damage step. Target creature gains trample and gets +X/+0 until end of turn, where X is its power. At the beginning of the next end step, destroy that creature if it attacked this turn.

2 V09 • ENSteve Prescott

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Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

10/4/2004
If the permanent stops being a creature before the end of the turn, it is still destroyed.