If we were to rank these Megas based on the modern Expanded Format, M Charizard-EX (X) from Flashfire would be on the list due to its heavy use in Regidrago V-Star decks, but in the XY Format, it was rarely even seen due to how slow it was to set up
While Im not sure that itll make a huge change to the gamestate outside of Lector Pendulum, it adds a good few good cards to the gamestate, and a fair number that seem like theyll age well
I used to frequent TGW in Gaines Township for all my Magic: The Gathering cards, and these days, they still have all kinds of trading cards, including Pokmon cards
Whether being an artifact is upside or downside will vary by format and game, but either way thats another aspect that can either push or balance the card, which any Cube designer can appreciate
They deal incremental damage for your opponents in their turn
Considering the route of summoning, Evil Twins is a very easy condition, but be careful not to inadvertently use resurrection or the like to prevent one from existing