Xathrid Gorgon is a rare Creature — Gorgon card from Magic 2013 (M13), collector number 118. Current market price: $0.32 (foil $0.42), TCGplayer market prices via Scryfall.
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) {2}{B}, {T}: Put a petrification counter on target creature. It gains defender and becomes a colorless artifact in addition to its other types. Its activated abilities can't be activated. (A creature with defender can't attack.)