Cheapest priced copy (Dominaria United): $0.35 at Card Kingdom, near mint, their price list as of .
Take Up the Shield 
Instant · Common · Marvel Super Heroes · #39
Put a +1/+1 counter on target creature. It gains lifelink and indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
6 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United | 35 | Common | $0.35 | $0.49 |
| Foundations Jumpstart | 270 | Common | $0.35 | — |
| Marvel Super Heroes | 39 | Common | $0.35 | $0.49 |
| Marvel Super Heroes | 348 | Common | $0.35 | $0.49 |
| Outlaws of Thunder Junction | 34 | Common | $0.35 | $0.49 |
| The List | J25-270 | Common | — | — |