Snake Umbra is a uncommon Enchantment — Aura card from Ultimate Masters (UMA), collector number 182. Current market price: $0.89 (foil $25.82), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card." Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)