Cheapest priced copy (Marvel's Spider-Man): $0.69 at Card Kingdom, near mint, their price list as of .
Doc Ock's Tentacles 
Artifact — Equipment · Rare · Marvel's Spider-Man · #277
Whenever a creature you control with mana value 5 or greater enters, you may attach this Equipment to it.
Equipped creature gets +4/+4.
Equip {5}
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.69 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel's Spider-Man Promos | 162s | Rare | — | $2.49 |
| Marvel's Spider-Man | 162 | Rare | $0.69 | $0.79 |
| Marvel's Spider-Man | 277 | Rare | $0.79 | $1.49 |
One ruling from Wizards of the Coast
- 19 September 2025If a creature has {X} in its mana cost, X is 0 when determining its mana value.