Cheapest priced copy (Marvel's Spider-Man): $0.35 at Card Kingdom, near mint, their price list as of .
Grow Extra Arms 
Instant · Common · Marvel's Spider-Man · #101
This spell costs {1} less to cast if it targets a Spider.
Target creature gets +4/+4 until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel's Spider-Man | 101 | Common | $0.35 | $0.49 |