Zuko, Exiled Prince is a uncommon Legendary Creature — Human Noble card from Avatar: The Last Airbender (TLA), collector number 163. Current market price: $0.27 (foil $0.31), TCGplayer market prices via Scryfall.
Firebending 3 (Whenever this creature attacks, add {R}{R}{R}. This mana lasts until end of combat.) {3}: Exile the top card of your library. You may play that card this turn.