Dog Umbra is a common Enchantment — Aura card from Modern Horizons 3 (MH3), collector number 22. Current market price: $0.21 (foil $0.33), TCGplayer market prices via Scryfall.
Flash Enchant creature As long as another player controls enchanted creature, it can't attack or block. Otherwise, this Aura has umbra armor. (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)