Cursed Cracktooth

Whenever Cursed Cracktooth becomes
the target of a spell or sorcery, it becomes
a 2/2 black human until end of turn.
The Swamps Curse: A curse that one can
behold by eating flesh in any swamp, causing
them to shapeshift into a humanoid crocodile.
— Page 72 of Curses & Demonology