Sheva, Death's Emissary

Flying, lifelink, deathtouch
Whenever Sheva enters the battlefield, target
creature gains Transfigure X, where X is that
creatures converted mana cost.
(Transfigure is X, Sacrifice this permanent:
Search your library for a creature card with the same converted mana cost as this permanent and put it onto
the battlefield. Then shuffle your library. Activate this ability only any time you could cast a sorcery.)