Contest of Claws

Sorcery

Target creature you control deals combat damage equal to its power to another target creature. If excess damage was dealt this way, discover X, where X is that excess damage. (To discover X, exile cards from the top your library until you exile a nonland card with converted mana cost/mana value X or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom of your library in a random order.)