Oros, the Avenger is a rare Legendary Creature — Dragon card from Planar Chaos (PLC), collector number 161. Current market price: $0.70 (foil $6.72), TCGplayer market prices via Scryfall.
Flying Whenever Oros deals combat damage to a player, you may pay {2}{W}. If you do, Oros deals 3 damage to each nonwhite creature.