The Abyss, Land of the Dead

{3}: Return The Abyss, Land of the Dead from your graveyard to the battlefield.
{t}: Add {w}, {u}, or {b} to your mana pool.
At the beginning of your upkeep, if The Abyss, Land of the Dead entered the battlefield from your graveyard, you may sacrifice a creature. If you do, return another target creature in your graveyard to the battlefield.