Steel Hellkite is a rare Artifact Creature — Dragon card from Scars of Mirrodin (SOM), collector number 205. Current market price: $0.55 (foil $9.74), TCGplayer market prices via Scryfall.
Flying {2}: This creature gets +1/+0 until end of turn. {X}: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by this creature this turn. Activate only once each turn.