Savra, Queen of the Golgari is a rare Legendary Creature — Elf Shaman card from Ravnica: City of Guilds (RAV), collector number 225. Current market price: $5.68 (foil $30.00), TCGplayer market prices via Scryfall.
Whenever you sacrifice a black creature, you may pay 2 life. If you do, each other player sacrifices a creature of their choice. Whenever you sacrifice a green creature, you may gain 2 life.