Fists of Flame is a common Instant card from Commander Legends (CMR), collector number 414. Current market price: $0.21, 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.)