Spoiler warning. This page gives away the puzzle from 20 September 2025. If you have not played it yet, try it first – five guesses, and it is still there.
The ultimate Crystal Beast dragon with field-clearing abilities.
Type: Effect Monster
Set: 25th Anniversary Tin: Dueling Heroes
CardMarket price: 0.03$
Text: (This card is always treated as an "Ultimate Crystal" card.)
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having 7 "Crystal Beast" cards with different names on your field and/or GY. This card cannot activate the following effects the turn it is Special Summoned. (Quick Effect): You can send all face-up "Crystal Beast" monsters you control to the GY; this card gains 1000 ATK for each monster sent to the GY. You can banish all "Crystal Beast" monsters from your GY; shuffle all cards on the field into the Deck.