Ravag, Lord Of Swafo

Whenever a creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature leaves a graveyard, create X 2/1 Zombie Elf creature tokens with Menace, where X is the greatest number of creature cards in a graveyard.
{2}{b}{g}: Destroy target creature. Return that creature to the battlefield under it's owner's control at the beginning of the next end step.

{x}{b}{g}: All players mill X cards, then return a creature card with converted mana cost X or less f