Hour of Reckoning [Commander 2011]

Set: Commander 2011 Type: Sorcery Rarity: Rare Cost: {4}{W}{W}{W} 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.)Destroy all nontoken creatures. "Ravnica, like a hedge, must be pruned, leaving only leaves of verdant uniformity." —Niszka, Selesnya evangel