(Mostly) colorless cube. This is an experiment and might be complete trash.

Rules:

1. The only basic land type allowed is Wastes.
2. Blue mana costs must be paid via non-basic lands, mana rocks, etc. and is generally intended to be splashed but you do you I'm not your keeper.
3. All non-blue color identities are treated as colorless.
4. All colored mana sources that do not specify a color can only produce blue mana.