Torgaar, Famine Incarnate is a rare Legendary Creature — Avatar card from Dominaria (DOM), collector number 108. Current market price: $0.36 (foil $0.60), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, you may sacrifice any number of creatures. This spell costs {2} less to cast for each creature sacrificed this way. When Torgaar enters, up to one target player's life total becomes half their starting life total, rounded down.