Fleshwarped Rider

Menace
Transfigure {1}{b}{r}({1}{b}{r}, Sacrifice this creature:
Search your library for a creature card with the same
mana value as this creature, put that card onto the battlefield, then shuffle. Transfigure only as a sorcery.)
Whenever you sacrifice Fleshwarped Rider, put a menace counter on a creature you control at the beginning of the next end step.