Calamity of the Titans [Commander Masters]

Set: Commander Masters Type: Sorcery Rarity: Rare Cost: {4}{C}{C} As an additional cost to cast this spell, reveal a colorless creature card from your hand. Exile each creature and planeswalker with mana value less than the revealed card's mana value. To the Zendikari, an apocalypse. To the Eldrazi, a day like any other.