Indrik Umbra is a rare Enchantment — Aura card from Planechase 2012 (PC2), collector number 96. Current market price: $1.10, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +4/+4 and has first strike, and all creatures able to block it do so. Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)