Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Mothra's Great Cocoon 
Mysterious Egg
Creature — Egg · 0/2 · Common · Ikoria: Lair of Behemoths · #385
Whenever this creature mutates, put a +1/+1 counter on it.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 3 | Common | $0.35 | $0.49 |
| Ikoria: Lair of Behemoths (Mothra's Great Cocoon) | 385 | Common | $0.39 | $3.99 |