Cheapest priced copy (Magic 2015): $0.49 at Card Kingdom, near mint, their price list as of .
Spirit Bonds 
Enchantment · Rare · Magic 2015 · #37
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.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 37 | Rare | $0.49 | $2.49 |
2 rulings from Wizards of the Coast
- 18 July 2014You decide whether to pay {W} as the triggered ability resolves. You may only pay {W} and create a Spirit token once per nontoken creature.
- 18 July 2014You can sacrifice any Spirit to activate the last ability, not just a Spirit token created by Spirit Bonds.