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Balance collecting with playing the game, and remember that the joy of the hobby lies in the experience itself, not just in owning valuable cards.

This is a replacement effect

Mavelus is used because of his lower ATK which allows to doge Bottomless Trap Hole and his worse attribute and type as a reborn target for opponents compared to Kamionwizard

In reality, it might be more of a 'Priority' pick

Since prerelease attendees were free to post their findings online, that meant the first global prerelease was the first moment at which WotC could no longer contain the information, thus the sets were made official at that time