Guan Cen, Deity of Mt. Dun Ti

This creature deals damage to creatures in
the form of -1/-1 counters.
Transfigure {1}{u} ({1}{u}, Sacrifice this
creature: Search your library for a creature card with the same converted mana cost as this creature and put that card onto the battlefield. Then shuffle your library. Transfigure only as a sorcery.)