Cheapest priced copy (Chronicles): $0.35 at Card Kingdom, near mint, their price list as of .
Cocoon 
Enchantment — Aura · Uncommon · Chronicles · #59
Enchant creature you control
When this Aura enters, tap enchanted creature and put three pupa counters on this Aura.
Enchanted creature doesn't untap during your untap step if this Aura has a pupa counter on it.
At the beginning of your upkeep, remove a pupa counter from this Aura. If you can't, sacrifice it, put a +1/+1 counter on enchanted creature, and that creature gains flying.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Chronicles Foreign Black Border | 59 | Uncommon | — | — |
| Chronicles | 59 | Uncommon | $0.35 | — |
| Legends | 178 | Uncommon | $1.49 | — |
3 rulings from Wizards of the Coast
- 4 October 2004Cocoon can be used on a tapped creature.
- 4 October 2004The creature can still be untapped using spells and abilities.
- 1 August 2005If the Aura is moved to a different creature, the number of counters is unchanged.