Mewoscarada, Giratina Ex, Red, Pokemon Center Lady, and Iono are all worth collecting, but with Darktina decks mostly out of the meta, Giratina Ex is seeing a lot less play, and the supporters are typically played in single copies
Similar to the Pokmon, the most playable supporters printed in full art or alternate art variants often end up being very expensive
Occasionally Ill use them to cast draw spells if the draw spell gets me back to Treasure parity, and of course if its the difference between life and death do what you need to keep your head above water
As I mentioned above, any cards you pull will match the language youve set the game to
Its a fantastic way to remove some combo pieces or deck-defining cards in basically any format, and its cheap enough to be played