Thornbite Staff is a uncommon Kindred Artifact — Shaman Equipment card from Mystery Booster 2 (MB2), collector number 99. Current market price: $11.51, TCGplayer market prices via Scryfall.
Equipped creature has "{2}, {T}: This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature." Whenever a Shaman creature enters, you may attach this Equipment to it. Equip {4}