Prerelease (and other MTG events) can be found through Wizards of the Coast's official Magic Events Locator
The other card that greatly affected the format was Pyroar
This card, Limit Reverse, would benefit a deck focused on swarming the field with low-ATK monsters for quick plays or combos, such as a Zombie or Insect deck
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With so many valuable Sun & Moon era cards soaring in price, this Ultra Ball is sure to continue its run up the charts, even if the top spot is out of reach