Felidar Umbra is a uncommon Enchantment — Aura card from Planechase Anthology (PCA), collector number 6. Current market price: $4.22, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has lifelink. {1}{W}: Attach this Aura to target creature you control. Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)