Spinerock Tyrant is a mythic Creature — Dragon card from Lorwyn Eclipsed Promos (PECL), collector number 159p. Current market price: $2.66 (foil $5.26), TCGplayer market prices via Scryfall.
Flying Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever you cast an instant or sorcery spell with a single target, you may copy it. If you do, those spells gain wither. You may choose new targets for the copy.