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Instant speed means it doesnt even have to be your own combat

Airtight Card Boxes An airtight card storage with a piece of desiccant can keep your cards dry and unexposed to outside elements

That has a lot of options, especially as you can copy a non-creature artifact like Spine of Ish Sah or Gilded Lotus

Cube Products Although WotC has never released any supplementary product related to Cube, Cube Cobra is a way to get a list that is export ready to be proxied, though many say that building the cube is half the fun

Be free to break those rules and differentiate as you see fit, as many times special builds/decks require quite different approach and it heavily depends on your preferred playstyle, the chosen commander and the mechanics in use, among other things as well