Cheapest priced copy (Marvel Super Heroes Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Stegron the Dinosaur Man 
Legendary Creature — Dinosaur Villain · 5/4 · Common · Marvel's Spider-Man · #95
Menace (This creature can't be blocked except by two or more creatures.)
Dinosaur Formula — {1}{R}, Discard this card: Until end of turn, target creature you control gets +3/+1 and becomes a Dinosaur in addition to its other types.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 810 | Common | $0.35 | $0.49 |
| Marvel's Spider-Man | 95 | Common | $0.35 | $0.49 |