Odyssey brought us three blue Thought Beasts--Thought Nibbler, Thought Eater, and Thought Devourer--all of which reduced your maximum hand size by two, three, and four, respectively
it makes for a more interesting story tapestry, and that seems to be whats happening in MTG
Returning to Courser of Kruphix decks, lets jump over to one of the Khan color combinations
As far as Magic Arena goes, there isn't really a way to get the deck cheaper than eight rares and four mythics since Dorothea, Vengeful Victim, Katilda, Dawnhart Martyr, and Hallowed Haunting are the foundations of the deck, although turning a rare dual land into Evolving Wilds does help with the cost a bit there as well
For a combo deck it's even worse, because you're likely to steal a couple of combo pieces and miss out on others, leaving you unable to secure the win
How much can we press it