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Zigzagged, however, in the sense that it doesn't stop you from creating and using a deck completely unrelated to the theme of the event in case the banlist doesn't restrict it, like the use of True Dracos and/or Monarchs (neither of which uses the Extra Deck in any way or form) during Extra Deck-themed Festivals

Hyper Synchron X LIGHT Level 4 [ MachineTunerEffect ] ATK 1600 DEF 800 If this card is sent to the Graveyard for the Synchro Summon of a Dragon-Type monster: That monster gains 800 ATK, also banish that face-up monster during the End Phase.

Just make sure one of those enchantments is Solemnity to keep everything coming back as often as you need

What are the top chase cards of Mega Evolution