Spirit Bonds is a rare Enchantment card from Magic 2015 (M15), collector number 37. Current market price: $0.48 (foil $2.04), TCGplayer market prices via Scryfall.
Whenever a nontoken creature you control enters, you may pay {W}. If you do, create a 1/1 white Spirit creature token with flying. {1}{W}, Sacrifice a Spirit: Target non-Spirit creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)