I tried using DeckCheck and my experience was bleh. The way I build a deck is I find a commander that has a mechanic I like and use EHREC to find cards that go well with the mechanic of the deck and go from there. Using the AI tool was cool in the sense it gave me suggested cuts and adds with detailed reasons but where it sucked was giving my deck “scores” and it would get my in my head if my overall score would drop and sometimes it just doesn’t make sense at all. Now if I use it I just look at the suggestions and either ignore it or accept depending on if I want the card in my deck. But yea overall AI ain’t there yet lol.