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You would technically eventually win by attacking but most would be conceding well before the lockdown reaches conclusion

It only deals 30 damage, but it also returns Shaymin and all of the cards attached to it to the player's hand, effectively allowing them to make use of Set Up indefinitely until they either run out of cards or Shaymin runs out of HP

All that would work is graveyard-into-library shuffling or exiling

In the video, the BBCE employee that authenticated it explained the processes that he used to sign off on the case

It can't get any rarer than this - when only one copy of a given card exists, you know it's uniquely special

If you control more than one creature with "This creature can't attack or block alone" they can attack or block together, even if no other creatures attack or block