Indestructibility is a rare Enchantment — Aura card from Magic 2014 (M14), collector number 23. Current market price: $1.57 (foil $5.32), TCGplayer market prices via Scryfall.
Enchant permanent Enchanted permanent has indestructible. (Effects that say "destroy" don't destroy that permanent. A creature with indestructible can't be destroyed by damage.)