If Mewtwo decks weren't good enough already, the Mythical Slab provides another way to draw your Gardevoirs and Mewtwos
Although the best when it is good, it is close to the nut low when not optimal
The ADV cards, on the other hand, feel like a sturdy napkin, haha
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Atlas here is likely the least efficient way imaginable to do that, but its here if you need it, and cheating it in a sacrifice deck might be fine
Details such as clothing, armour and props should feel connected to the characters world and their environment