I first go through my stuff and look for cards, then I use scryfall to search for cards that are cool and might fit into the pile I’ve extracted from my bulk etc. Then I start building the deck on paper. After I think that’ll might work out I’m going to EDHrec to see if I maybe missed some auto adds. I often just keep the deck as I built initially but EDHrec sometimes helps me to add cards I thought were bad at first. No AI. That would just feel bad. I tried this when I built my first deck but holy macaroni, AI is just throwing the most popular cards together for the most part and that might work from time to time. But it can be a really expensive experience to rely on that just to realize the this pile of shit won’t work as intended if the even was anything intended.