Some obvious candidates come to mind, with the Power Nine being the first and foremost ones
Missy (Mass Removal) Missy is a commander that encourages you to kill as many creatures as possible, as it turns any creature that dies into a 2/2 Cyberman on your side of the battlefield
Highlights of the Week: Unlimited Power Nine We are starting this weeks New Arrivals Drop with a few of the most powerful cards in the history of Magic: The Gathering
July 12, 2018 Update 0.06.00.000 Release Notes Chris Clay (September 26, 2018)
3) Lock in the format constraints (so you stop accidentally cheating) This is the boring part that prevents the even more boring part where you rebuild your deck because one card is illegal
Since she's able to travel the halls more freely than survivors, she helps carry messages and supplies between multiple groups, giving each a better chance at obtaining the resources they need to survive