Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Resistance Reunited 
Instant · Uncommon · Phyrexia: All Will Be One · #31
Target creature gets +2/+2 until end of turn.
Equipped creatures you control gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 243 | Uncommon | $0.35 | — |
| Phyrexia: All Will Be One | 31 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 4 February 2023The set of creatures that gains indestructible is determined as Resistance Reunited resolves. After that point, an equipped creature that gained indestructible won't lose indestructible if it becomes unequipped. Similarly, one that didn't gain indestructible won't gain it should it become equipped.
- 4 February 2023If the target creature is no longer a legal target as Resistance Reunited tries to resolve, it won't resolve and no creatures will gain indestructible.