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You're already deep in blue, so if you're playing an artifact-heavy strategy, you may be able to replay most (if not all) of your entire hand once it becomes your turn

Another reason could be that WotC wanted to sell lots of sealed product in Alpha/Beta/Unlimited to generate interest

Pairings include Reshiram & Charizard-GX, Marshadow & Machamp- GX , Gardevoir & Sylveon- GX , Greninja & Zoroark- GX , Muk & Alolan Muk- GX , Ultra Beasts Pheromosa & Buzzwole- GX , and Lucario & Melmetal GX

Returning any nonland permanent to an opponents hand can hinder them from building their board state

Packaging may have different cover art

Dealing two damage to each character your opponents control is a great way to either wipe the board or get a head start on taking things out