Berserk (CEI 186)

Instant • Mana cost: {G} • Intl. Collectors' Edition • Uncommon

Cast this spell 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.

Illustrated by Dan Frazier.