My first cube, a pretty neat mess that started as just what I had lying around and has now had over 300 of its original cards
swapped out.

It has blink, it has graveyard shenanigans, it has aristocrats, it has spells-matter, it has tokens, it has some (convoluted)
combos nestled in there, it has niche build-around cards. Archetypes are loose and spread really wide across the colors so a lot
of cards can be contested.