Steel Hellkite [Scars of Mirrodin]

Set: Scars of Mirrodin Type: Artifact Creature — Dragon Rarity: Rare Cost: {6} Flying{2}: Steel Hellkite gets +1/+0 until end of turn.{X}: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by Steel Hellkite this turn. Activate only once each turn.