With over 9000 cards available to collect in the game, the possibilities are quite literally endless here, and there's a lot of room for experimentation
The strategy is to play Mewtwo in the active slot after you have built up enough energy and then use Gardevoirs Psy Shadow ability to refill Mewtwos energy for Psydrive each round, pulling an extra energy alongside the one you are automatically given every round
A complete master set needs every variant below, so track each one in your collection
Later on though, WotC limited this part of the policy when they started printing extremely limited release promos, mostly Judge Rewards
Some cards in Duskmourn: House of Horror have alternate artwork (and collector numbers) from their main set counterparts that contain a monster of Duskmourn lingering in the background
My ultimate goal was to be able to summon my Sorcerer of Dark Magic, Dark Paladin, My Dark Magicians fusion monster or my Dark Magician the Dragon Knight