Cubing already has enough headaches insofar as sleeving all of the cards, making sure everyone returns the basic Energy to the right place, and making sure all the cards get back properly, that I recommend against adding another annoyance
Mayael the Anima I remember Mayael being one of the coolest cards that did the silliest things in Commander
But you do have to wonder how the visual theme would be handled if other enchantments were chosen instead
Keep an eye on this one: its sneakily one of the better entries on this list
While you can tune engines to draw extra cards and control the game, some tactics are simply more consistent (bunnies can easily overwhelm an opponent, for example, thanks in part to the new Offspring mechanic)
Some of these fake gold cards are just scanned copies of real Pokemon cards while others are completely fan-made if you will look at their text