Mazolirth, The Cycle Dragon

Indestructible, Flying, Vigilance
Mazolirth cannot attack, block, or activate abilities unless it has five or more charge counters on it
Whenever a creature is put into a graveyard, put a charge counter on Mazolirth
Whenever Mazolirth attacks, you may return target creature card from your graveyard to the battlefield
{2}{w}{b}{t}: you may cast a creature card from your graveyard