Hogaak, Arisen Necropolis{5}{B/G}{B/G}

Legendary Creature — Avatar

You can't spend mana to cast this spell. Convoke, delve (Each creature you tap while casting this spell pays for {1} or one mana of that creature's color. Each card you exile from your graveyard pays for {1}.) You may cast this card from your graveyard. Trample