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Im going back tomorrow, what should I buy that will be best to resell

The complete Age of Overlord set consists of 50 Commons, 26 Super Rares, 14 Ultra Rares, and 10 Secret Rares

Picking them up wont break your bank but you are going to have a hard time moving these in quantity, unless theres a severe and unexpected surge.

If you look at a black or white border on a fake card you'll find those colored specs there unlike on genuine card where you either won't see any or you'll see some kind of white specs/scratches

For this second pack, you are guaranteed to pull at least one rare card (it appears the minimum is a 3 Diamonds, but 1 Gold Star, an Illustration Rare, have been more common)

Armageddon Knight