So, let's say everyone gets 20 points. Spark Bolt is worth 2 points, Bomb is worth 4 points, Bounce is worth 2 points, Vampirism is worth 12 points, eceteria. You can create a custom loadout (comprised of spells, modifiers, and perks that you have unlocked) to use at the start of the run that is customized through a point system to balance the amount of spells/ modifiers you can select.