Mahvin, The Bringer

Whenever Mahvin, The Emissary or another ally enters the battlefield you may create a Devil Creature token enter the battlefield. If you do put a +1+1 counter on Mahvin, The Emissary.
{b}{r}{b/r}{b/r}{2}: Exile Mahvin, the Emissary, then return him to the battlefield transformed under his owner's control. Activate this ability only any time you could cast a sorcery.