Update: Its been found in a Costco store and seems very real, though no official announcements have been made yet
There is no limit on the number of Special Summons you can perform per turn
This can be particularly true for Commander decks in MTG , as they have a rule restriction that makes players forced to use no more than one copy of each card, so they all matter

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Therefore, for high-value raw cards, the buyers nervousness is exactly why authentication helps you