Gorath, Zombie Rot Master

When Gorath, Zombie Rot Master enters the battlefield, return target creature card from your graveyard to the battlefield with converted mana
cost X or less, where X is the number of
creature cards in all graveyards.
{2}{b/g}{b/g},{t}: Return target creature card from your graveyard to the battlefield with converted mana
cost X or less, where X is the number of
creature cards in all graveyards.
Partner with Israth, Zombie Experimenter