Aegis Angel (M15 270)

Creature — Angel • Mana cost: {4}{W}{W} • Magic 2015 • Rare

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.)

Illustrated by Aleksi Briclot.