I test my changes in Forge before making the actual swaps, and I work from a change list in Notepad++ Only when I decide to actually replace a card, I cut it from my Forge cube list, paste the cut card into my change list, so I can keep track of which card gets replaced by which, and then when I'm finally done I order cards, wait for all the shipments to come in, then delete entries from my change list one by one as I replace the actual cards in the cube. I usually update my Cube Cobra list somewhere between ordering my cards and updating my physical cube.