Ugin is already a very heavy card, if you use the -10 to get more threats on the board you are almost certainly over extending
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They went ahead and included 353 total cards, which is quadruple a normal pack of about 75 cards
Updated 7 November 2023 with information on Legendary Collection Deck Exclusive Version and updated pricing info
No filler, no bulk, no commons just a graded hit, a sealed rip, and a bonus card to round it out
However, they are widely accepted for "kitchen table" casual play, playtesting decks, and Cube drafts, provided they are clearly marked as proxies and not sold as authentic cards