Errant, Street Artist is a rare Legendary Creature — Human Rogue card from Streets of New Capenna Promos (PSNC), collector number 41p. Current market price: $0.40 (foil $0.48), TCGplayer market prices via Scryfall.
Flash Defender, haste {1}{U}, {T}: Copy target spell you control that wasn't cast. You may choose new targets for the copy.