Conclave Tribunal [Guilds of Ravnica]

Set: Guilds of Ravnica Type: Enchantment Uncommon Cost: {3}{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.) When Conclave Tribunal enters the battlefield, exile target nonland permanent an opponent controls until Conclave Tribunal leaves the battlefield.