Caduceus, Staff of Hermes is a rare Legendary Artifact — Equipment card from Assassin's Creed (ACR), collector number 2. Current market price: $9.40 (foil $9.11), TCGplayer market prices via Scryfall.
Equipped creature has lifelink. As long as you have 30 or more life, equipped creature gets +5/+5 and has indestructible and "Prevent all damage that would be dealt to this creature." Equip {W}{W}