The Raider of the Nine

When The Raider of the Nine enters the battlefield, exile the top card the opponent's deck.
Devour: After gaining {b}{b}{b}{10} or more manna, destroy 30 cards from the opponent's deck.
Burrow then tremor: When {3} or more manna, this card can not be destroyed or blocked until tapped after attacking.
It isn't so scary when one mouth is in view, but 1000. Now that's terrifying!