I'm not sure if any Cube (or at least anything close to the box of normal Cube design) could reach that saturation point though, especially if abiding by the singleton rule. Hybrid is basically all upside IMO up to a certain point.
So, now that this giant cube mistake has been addressed, who is going to tackle the other big one?
"Card X exists, therefore I can't play Card Y."
I see this one all the time and it makes me cry. The cube is a limited environment. The only thing that matters to a card in the cube is the other cards in the cube. If a card would cause make problematic/overshadow/invalidate certain cards that you enjoy you could always, you know, not put it in. The fact that a card exists NEVER matters to your cube. The fact that YOU CHOOSE to put it in MAKES it matter. The performance of your cube is NEVER anyone's fault but YOUR OWN.