Exploring Color

I made the beginnings of this cube a while back as a gimmick, with a bunch of modern cards that have black and X options, like double-faced Strixhaven cards, and some weird hate-specific-color cards like Compost. It stayed small for quite some time until some ideas bled over from 360 Strategy Cube...

I loved the mana-intensive Khans of Tarkir limited format, and in this cube i've tried to emulate the feeling of not having enough mana