Elemental HERO Aqua Neos (LCGX-EN057) - Legendary Collection 2 Unlimited

"Elemental HERO Neos" + "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 discard 1 card; destroy 1 random card in your opponent's hand. During the End Phase: Shuffle this card into the Extra Deck.