Made a three-color cube for drafting with my nephews. They're still a bit new to drafting and I'm still a bit new to making cubes, so the restricted scope felt sensible. Definitely feels like plenty of new cards to add have come out despite ignoring two colors entirely. We enjoy drafting it Winston style, shuffling it all and drawing 135 cards (45 per player) into a stack to draft from. We've only had so many chances to draft it and I keep making changes, so I know it for sure ain't perfect, so feedback is very welcome.
Haven't touched his cube in a while, but I wanted to put in cards I've acquired since. I dunno, maybe the additions made it objectively worse, definitely could've done more planning to exactly what fits in best and serves a role, but I just wanted to give the cards a home.