While there hasnt been much detail about the new mechanics Mega ex cards will utilize, we have an idea of how they will function just from the Mega Lucario ex and Mega Gardevoir ex that were revealed during the trailer
The community has created a huge number of unofficial ways to play Pokmon, introducing wildly different rules to change the pace and strategies of matches, switch up the most competitive cards, and more
(Effects that activate by flipping the monster face-up are not activated yet) Effects that activate at the Damage Step can be activated at this point
These are designed for cards of 70 MM X 110 MM, Lost Cities for example They are 100 per pack and priced for bulk purchasing
Neutral power cards like Ash Blossom & Joyous Spring, Infinite Impermanence, and Pot of Extravagance slot into most decks
The first effect allows you to add a monster that mentions Light and Darkness Ritual and then discard a card