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If the binder is mostly staying inside, or not holding very valuable cards, you probably wont have much need for a zipper, but if the binder will be frequently bouncing around a backpack, or holds more valuable pieces of your collection, a zipper may be in order.

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Also in Pokmon GO, new content is continually released

I like using index cards because they are sturdier than paper, are very inexpensive, and come already cut to size

Some of these are problematic with the fundamentals of the format, like Karakass ability to shut off any commander at virtually no cost, or the way Trade Secrets lets you collude with an opponent to each virtually draw your deck