Indestructibility is a rare Enchantment — Aura card from Magic 2010 (M10), collector number 17. Current market price: $1.11 (foil $2.48), 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.)