The first thing I'd do is create categories to sort the cards into (lands, removal, card draw/filtering, win conditions, etc.). For
Augur of Bolas and Kefnet, the instant & sorcery count in your deck is too low (about 1 in each 3 cards). For Augur, you only have a 71% chance of hitting a card (my personal threshold for important events in my decks is 80%), and for Kefnet, it's 33%.
Complete Disregard is definitively inferior to
Hero's Downfall,
Power Word Kill,
Baleful Mastery or
Heartless Act. Instead of 4
Languish, I'd try to "mix it up" a bit, meaning I'd take maybe 2
Languish, and 1 of each of two different wrath effects that hit other selections of creatures, so that you have an answer to a broader range of decks. Give
https://mtgdecks.net/Pioneer/dimir-control a shot and look at some of the winning decklist to get an idea what the most efficient cards are currently. I really like
Murderous Rider, btw., even if it's not much played at the moment.