Ritual You cast an instant or sorcery spell
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
One of the worst feelings in Modern is playing a matchup that you have no sideboard cards for because you played too many cards for another matchup
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 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