Spoiler warning. This page gives away the puzzle from 27 October 2025. If you have not played it yet, try it first – five guesses, and it is still there.
A mystic mine that prevents effects and attacks based on monster count.
Type: Spell Card
Set: 2020 Tin of Lost Memories Mega Pack
CardMarket price: 0.29$
Text: If your opponent controls more monsters than you do, your opponent cannot activate monster effects or declare an attack. If you control more monsters than your opponent does, you cannot activate monster effects or declare an attack. Once per turn, during the End Phase, if both players control the same number of monsters: Destroy this card.