Pathkeeper Cerberus

Flying
When Pathkeeper Cerberus enters the battlefield,
exile all cards from all graveyards.
You may play nonland cards you own exiled
with Pathkeeper Cerberus. Creature spells you
cast this way are black and red Demons in
addition to their other colors and types. (This
effect remains when those creatures enter the
battlefield.)
They ensure that those who reach the end of their last life are forced through the 13 Paths, trials designed to strip away all semblance of humanity.