Berserker Rage

Target creature gains trample and +X/+0 until end of turn, where X is its power. At the beginning of the next end step, exile that creature if it attacked this turn.
"What happened to Wolverine is the biggest mystery of them all. Some say they hurt him like no one ever hurt before. Others say he just grew tired of all the fighting and retired to a simpler life."
"Either way he hasn't raised his voice or popped his claws in fifty years. His old friends would barely recognize him now."