Moku, Meandering Drummer is a uncommon Legendary Creature — Human Bard Ally card from Avatar: The Last Airbender Eternal (TLE), collector number 122. Current market price: $0.18 (foil $0.30), TCGplayer market prices via Scryfall.
Whenever you cast a noncreature spell, you may pay {1}. If you do, Moku gets +2/+1 and creatures you control gain haste until end of turn.