Hour of Reckoning [Phyrexia: All Will Be One Commander]

Set: Phyrexia: All Will Be One Commander Type: Sorcery Rarity: Rare Cost: {4}{W}{W}{W} Convoke (Each creature you tap while casting this spell reduces its cost by 1 or by 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