The Doom of Djeruba

Prophecy (When you draw this, you may exile it
face up. At the beginning of your upkeep, if it's exiled
this way, put a prophecy counter on it. You may cast
it for as long as it remains exiled, and it costs {1} less
for each prophecy counter on it.)
Return all creatures in graveyards to the
battlefield under their owner's control. Each
player loses 1 life for each creature that entered
the battlefield this way.