Certain builds are too easy/rampant, primarily focusing on increasing the weapon damage even in challenge runs.

Now imagine that you are forced into running upgrades of just one specific colour. I excluded Luck because you are less likely to get it often enough to work. I did however leave Weapons in for fairness sake as the odds are even among four options.

Since there are typically multiple colors on one block you naturally can only activate those that match your colour scheme- If you can ONLY run a build centered around Weapons (meh), Dice, Cards or Conjurations you are forced to rely on more than just brute forcing or auto attacking. Secondary abilities or tosses become much more important and will define the playstyle.

The colour can be chosen randomly or if you want to get your community inolved have them vote on the build.