Aegis Angel is a rare Creature — Angel card from Welcome Deck 2016 (W16), collector number 1. Current market price: $0.33, TCGplayer market prices via Scryfall.
Flying (This creature can't be blocked except by creatures with flying or reach.) When this creature enters, another target permanent gains indestructible for as long as you control this creature. (Effects that say "destroy" don't destroy it. A creature with indestructible can't be destroyed by damage.)