This being, not a card, IIRC should not be considered an insert because it isn't a card. I know there is already another example, the rulebook for One on One being an insert
https://www.tcdb.com/Inserts.cfm/sid/61383/
Despite being a CCG, I believe sets in the gaming category do not have their rulebooks as cards. I'm not sure where I had read it before, but things like this were to be considered packaging. Maybe someone else here knows what I am refering to.
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