It happens, but it's a questionable cube card IMO
History[] Previously, the Side Deck could not be used to alter the contents of the Extra Deck, though this has been changed
Here are all the cards you need for 'Guidance of the Sun and the Moon': Solgaleo Ex #207 (Rainbow / Two Gold Star) Lunala Ex #204 (Rainbow / Two Gold Star) Rewards: 12 Pack Hourglasses, 36 Pack Wonder Hourglasses and 10 Shop Tickets
While it can be a powerful addition in the right deck, other cards like Chaos Emperor Dragon - Envoy of the End or Dark Armed Dragon may offer more immediate impact and versatility, making them potentially better choices depending on the strategy of the deck
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I going to try to do a few more cards, maybe Megas but not following the official TCG footsteps