Changed Cruise to Mana Drain, sideboard changed Dread to Spitters and cut third Leyline for another Mana Drain. Went 4-3 in P9 challenge. Losses to Dredge, Esper Mentor, and Montolio (Tks Shops). Beat Dredge, UW Standstill, Blue Moon, and UWR Mentor. Main deck feels pretty good at this point. I might want to change 1 of the colorless lands or the basic swamp to some other land (Bayou or Trop). Sideboard is very tough to figure out. You need certain cards like Cage to not auto lose to Oath but maybe Oath is so small a % it is worth skipping? They would just be more Leyline anyways though. Spitters are great against White Eldrazi and Grixis but suck against TKShops and Mentor. Idk what to do with the board from here.