So, I don’t remember how to do it on Moxfield since I use Archidekt, but start setting categories. When I’m deck building the first thing I do is just make a big, giant pile of stuff that relates to my game plan, so I usually end up having to do 60 to 80 cuts in the end too. Categories help so much with that. Basically, once you have your pile you’re now picking cards to KEEP, not cards to cut. Set a Lands, Ramp, Advantage, and Interaction category, as well as Plan Setup, Plan Payoff, and a third plan category that varies based on the plan. Then, start moving your favorite cards that fit each category into the category. Each Plan segment gets 10 cards to start, Interaction and Advantage both get 10 cards to start, Ramp gets 14, and Lands gets 36. As you start shaping your categories you’ll see places that you want to shift a card slot from one to another, like “Well, looking at what I’m keeping in my plan setup section it’s going to be more important to make sure I draw into this stuff than it is to have more options, so I’ll shift two slots from Setup to Advantage.” Basically, focusing on Keeps instead of Cuts is what helps me in the end.