Darkheart Crypt

Creature cards in your graveyard have
recover. Each creature card's recover cost is {2}{b}. (They have, 'Whenever another creature
you control is put into your graveyard, you may
pay {2}{b}. If you do, return this card from your graveyard to your hand. Otherwise, exile it.')
One of the many corruptors of the dreaded mountains of Azda.