Flipping him back and forth is easy and can lead to some incredibly fun shenanigans
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Delirium is not hard to achieve, and the activated ability to become any permanent in your graveyard (ANY type of permanent, no restrictions) is very very powerful
However, we speculate that cards that some eager players would love to still add to their decks, like the (P-A 014) Lapras ex, could always return in the form of other events or even future booster pack expansions
I recommend starting with Z and working backwards so that by the end your cards are in alphabetical order with A or a number at the front
There's loads of it right there in the Pokedex