Ryuko, the All-Consuming

Deathtouch, menace, haste
Whenever a permanent card is put into a
graveyard from anywhere, exile it and put a
+1/+1 counter on Ryuko.
When Ryuko leaves the battlefield, flip a coin
for each permanent card exiled with him.
Return each permanent card whose coin comes
up heads to the battlefield tapped under its
owner's control.