Card Rulings:Cocoon of Evolution


 * If "Cocoon of Evolution" is Summoned or Set it is treated as a monster, if played as an Equip Spell Card it is treated as an Equip Spell Card as long as it remains on the field and could be destroyed with "Mystical Space Typhoon". Once on the field it cannot be switched from monster to Spell Card or vice versa.  "Cocoon of Evolution" is NOT a Union Monster.

The Japanese rulings provide furthur clarification.


 * The effect is a modification of a Normal Summon. It uses your turn's Normal Summon, and is not chainable.  You can respond to it.


 * It is not a Normal Summon, so Horn of Heaven, Torrential Tribute etc. cannot be used. It is not the activation of a Spell Card, so Magic Jammer etc. cannot be used.  It is not the activation of a monster effect, so Divine Wrath etc. cannot be used.  Prohibition can prevent its use.


 * You may use Ultimate Offering to equip it to Petit Moth, but only during your Main Phase.