Nullhide Ferox is a mythic Creature — Beast card from Guilds of Ravnica (GRN), collector number 138. Current market price: $0.22 (foil $0.47), TCGplayer market prices via Scryfall.
Hexproof You can't cast noncreature spells. {2}: This creature loses all abilities until end of turn. Any player may activate this ability. If a spell or ability an opponent controls causes you to discard this card, put it onto the battlefield instead of putting it into your graveyard.