Spoiler warning. This page gives away the puzzle from 16 August 2025. If you have not played it yet, try it first – five guesses, and it is still there.
A Contact Fusion monster from the GX era, combining Neos with Marine Dolphin.
Type: Fusion Monster
Set: Legendary Collection 2: The Duel Academy Years Mega Pack
CardMarket price: 0.47$
Text: "Elemental HERO Neos" + "Neo-Spacian Marine 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 1 random card in your opponent's hand.