Judith, the Scourge Diva is a rare Legendary Creature — Human Shaman card from Ravnica Allegiance (RNA), collector number 185. Current market price: $0.30 (foil $0.50), TCGplayer market prices via Scryfall.
Other creatures you control get +1/+0. Whenever a nontoken creature you control dies, Judith deals 1 damage to any target.