RocketExecutive in a VM to me said:It's a stadium, and when you play it whoever has 6 or more pokemon in the lost zone automatically loses. So the idea is to play it with gengar prime, which, depending on how much psychic energy is attached to it, can send pokemon directly from the opponents hand into the lost zone. It's the first time a card that essentially says 'play this card; you win the game' has been introduced, and people are resistant to the change. I think it's overestimated, and there are surely ways to play around it.