Hogaak, Arisen Necropolis
Legendary Creature — Avatar, {5}{B/G}{B/G}
Oracle Text
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