Sizzling Soloist is a uncommon Creature — Human Citizen card from Streets of New Capenna (SNC), collector number 123. Current market price: $0.25 (foil $0.29), TCGplayer market prices via Scryfall.
Alliance — Whenever another creature you control enters, target creature an opponent controls can't block this turn. If this is the second time this ability has resolved this turn, that creature attacks during its controller's next combat phase if able.