Lazarus Pit

Lazarus pit comes into play tapped.
{t}: Add a charge counter to Lazarus Pit.
{2},{t}: Remove a charge counter from Lazarus pit, then return target creature from your graveyard to play. That creature is now a zombie in addition to its other types.
As long as Lazarus pit is untapped, you may pay 1 life and remove a charge counter to regenerate target creature.