Volrath the Fallen is a rare Legendary Creature — Phyrexian Shapeshifter card from Nemesis (NEM), collector number 75. Current market price: $2.66 (foil $83.60), TCGplayer market prices via Scryfall.
{1}{B}, Discard a creature card: Volrath gets +X/+X until end of turn, where X is the discarded card's mana value.