Many tournament players use this method, keeping all their Standard-legal cards in a binder (or groups of binders)
It was such a funny problem for Wizards of the Coast to have to tackle and a rod that, really, they'd made for their own back by picking an IP so disconnected from the general vibe of Magic: The Gathering
I tried to guess which cards with this ability would be the best in Commander, but my reasoning was somewhat flawed
Gates is very much a five-color strategy, and while Nine-Fingers Keene is great in those decks, it should not itself be a commander
It's also more difficult to pin down a set booster's rarity ratio, with each slot in the pack having its own chance of being a different rarity
Of course, if you know about your friends playstyle, you can pick the most suitable booster pack for their decks, but chances are you dont