Dr. Facilier,The Shadow Man

Affinity for Demons

Friends on the other side - At the beginning of your upkeep if you control no demons, sacrifice Dr. Facilier.

Shake my hand - Put three -1/-1 counters on target demon you control: Target creature an Opponent controls becomes a 1/1 frog and gains "When a demon deals combat damage to you, sacrifice this creature."

Shadow Work - At the beginning of your end step choose target opponent. If that opponent controls only frogs, they lose the game.