Grease-o-mancy

When Grease-o-mancy ETBs, exile target player's graveyard.
{1}{b}{g}, Choose 2 creatures in exile: Return those creatures to their owner's graveyard,
then create a 2/2 greaseling elemental with menace.
"We're not done with these bodies yet!"
-Hakrath, Deranged Necromancer