Lockjaw Snapper is a uncommon Artifact Creature — Scarecrow card from Shadowmoor (SHM), collector number 255. Current market price: $1.54 (foil $9.65), TCGplayer market prices via Scryfall.
Wither (This deals damage to creatures in the form of -1/-1 counters.) When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it.