You can pick and choose individual cards, or you can create specifically themed modules that you can swap out between games
These also work well for against anyone playing a Rat Colony deck or any you can have as many copies type cards
Credit: Wizards of the Coast Ulamog, the Defiler Marcy: I love how just bonkers powerful this card really is, like your opponent is likely to just scoop to losing half of their library, but then they also have to deal with something that will otherwise very likely wipe out every permanent they control when it swings, and also one shot them
Bruse Tarl excels there thanks to its versatility, helping you stabilize or push your advantage by granting different keywords to your creatures, depending on the situation
[casthaven]Eye of Ugin[/casthaven]
Brudiclad doesn't show up as a popular commander for this card, and I think that's wrong