Natasha of Two Worlds

+3: Have target creature an opponent controls deal damage to itself equal to its power. You gain life equal to this damage.
-X: Tap X creatures target opponent controls. Up to X creatures you control gain first strike and vigilance until end of turn.
-14: Search your library and/or graveyard for up to seven creatures and/or planewalkers and put them onto the battlefield. Shuffle your library.