If you don’t know, unlike previously CMC of split cards is now the sum of the two parts. This was done due to the abuses on older split cards with cards like As Foretold and the different Expertises (mostly Kari Zev’s Expertise). On the other hand, there are cards that like your cards being expensive.

There’s two split cards in Amonkhet that seem strong here.

creatures (6) 4 Combustible Gearhulk 2 Noxious Gearhulk spells (28) 2 Liliana, the Death’s Majesty 2 Ob Nixilis Reignited 3 Sorin, Grim Nemesis 2 Nahiri, the Harbinger 3 Painful Truths 4 Never // Return 4 Cut // Pieces 4 Tormenting Voice 4 Fatal Push lands (26) 4 Inspired Vantage 4 Concealed Courtyard 4 Shambling Vent 4 Needle Spires 4 Evolving Wilds 1 Plains 3 Swamp 2 Mountain

The manabase definitely sucks and would require some work. Actually a lot of work.