Impervious Greatwurm (Buy-A-Box) [Guilds of Ravnica]

Set: Guilds of Ravnica Type: Creature — Wurm Rarity: Mythic Cost: {7}{G}{G}{G} Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)Indestructible The ultimate answer to intrigue and subtlety.