Judith, Carnage Connoisseur is a rare Legendary Creature — Human Shaman card from Murders at Karlov Manor (MKM), collector number 210. Current market price: $0.39 (foil $0.51), TCGplayer market prices via Scryfall.
Whenever you cast an instant or sorcery spell, choose one — • That spell gains deathtouch and lifelink. • Create a 2/2 red Imp creature token with "When this token dies, it deals 2 damage to each opponent."