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Personally Id say Yes to authentication only if marked as Altered. Regardless if its an autograph or not it should be known as altered
![yugioh world championship 2018 prize card Black Envelope [Japanese] YGOrganization | Worlds 2018 Prize](https://cdn.ygorganization.com/2018/08/130004ac9tucm945bhczgw.jpg)
Interspersing them with a cut or overhand shuffle can help avoid cards getting stuck on the top or bottom of the deck, but if you're riffling/mashing properly this won't be an issue in the first place
![yugioh world championship 2018 prize card Black Envelope [Japanese] YGOrganization | Worlds 2018 Prize](http://store.401games.ca/cdn/shop/files/Yu-Gi-Oh-World-Championship-2018-Envelope-with-Blue-Eyes-Dark-Magician-Promos-2_1024x1024.jpg?v=1708024541)
1 - All those "Messing With My Mana" cards Yes, this is a cop-out answer but I stand by it
![yugioh world championship 2018 prize card Black Envelope [Japanese] YGOrganization | Worlds 2018 Prize](https://cdn.cardsrealm.com/images/cartas/2018-yu-gi-oh-world-championship-2018-prize-cards/en/crop-med/noritoshi-in-darkest-rainment-en001.jpeg?4798)
Youll commonly see a card drop in a few weeks and then raise again in the future back to its high
![yugioh world championship 2018 prize card Black Envelope [Japanese] YGOrganization | Worlds 2018 Prize](https://lookaside.fbsbx.com/lookaside/crawler/media/?media_id=1982467792003148)
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