Your card cases should provide the best possible protection for your cards, with the material being secondary
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
Ritual You cast an instant or sorcery spell
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
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
The former can come in as copies of Cosima, and, if theyre around on your upkeep, can be sent away using her trigger