White creatures usually have lots of keyword abilities like flying, first strike, double strike, lifelink, or vigilance, and as such it makes sense to enhance those
In addition, the Nessian Boar can hit with 10 damage, and forces absolutely everything on the field to attack it - making it a beast that laid waste to my defences quite a few times
In terms of direct impact on the game, Mishra's Bauble might as well not exist - and if you want to increase the consistency of your draws, that's perfect
Pixie GuidePixie Guide and Barbarian ClassBarbarian Class translate this concept to Magic: the Gathering
If your commander has only colorless mana symbols, such as Karn, Silver Golem or Ulamog, the Ceaseless Hunger, you can only use lands that produce colorless mana