Fists of Flame is a common Instant card from Avatar: The Last Airbender Eternal (TLE), collector number 166. Current market price: $0.23 (foil $0.70), TCGplayer market prices via Scryfall.
Draw a card. Until end of turn, target creature gains trample and gets +1/+0 for each card you've drawn this turn. (A creature with trample can deal excess combat damage to the player or planeswalker it's attacking.)