You can absolutely make your own cube, even designed so that some weird cards have good uses, or are working combos. You can have a very low powered cube where

You can absolutely make your own cube, even designed so that some weird cards have good uses, or are working combos. You can have a very low powered cube where people draft something janky like Chamber of Manipulation highly if you slow down the game enough. But at that point you need quite a bit of testing/game design skills, because cubes become unbalanced pretty easily. Hell, even the magic online cubes sometimes have big mistakes, with cards that never get played, or situations where a color combination is just too viable, while others are outright traps.