Hogaak, Arisen Necropolis [Modern Horizons]

Description

Set:	Modern Horizons
Type:	Legendary Creature — Avatar
Rarity:	Rare
Cost:	{5}{B/G}{B/G}

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 Hogaak, Arisen Necropolis from your graveyard.
Trample