Thornwatch Scarecrow is a common Artifact Creature — Scarecrow card from Shadowmoor (SHM), collector number 265. Current market price: $0.18 (foil $6.89), TCGplayer market prices via Scryfall.
This creature has wither as long as you control a green creature. (It deals damage to creatures in the form of -1/-1 counters.) This creature has vigilance as long as you control a white creature.