"Elemental HERO Neos" + "Neo-Spacian Air Hummingbird" + "Neo-Spacian Aqua Dolphin" Must first be Special Summoned (from your Extra Deck) by shuffling the above cards you control into the Deck. (You do not use "Polymerization".) Once per turn: You can destroy all Spell and Trap Cards on the field. During the End Phase: Shuffle this card into the Extra Deck. When this card is shuffled into the Extra Deck this way: Shuffle all cards on the field into the Deck.
When this card returns to Extra Deck, it can return all the cards on the field back to the owner’s deck.
Requires 3 specific monsters to perform Contact Fusion.
Returns to Extra Deck during your End Phase. Monsters used for Contact Fusion does not return to field.
Although the effect of returning to Extra Deck may seem dangerous, but it is also a strategic move because Storm Neos can return all the cards on the field back to your opponent’s deck. If your opponent is left with little cards in their hands, it is very hard for them to make a comeback.
As it is not a proper Fusion Summoning, not just because both monsters must be on the field and returned to the deck, but also because there is no Fusion card involved. Its just a regular Special Summon.