If you want the mono-black, go-wide rat-swarm experience most people mean by rat deck, start with Marrow-Gnawer or Karumonix
So why do you want to put a Contraption in your deck or crank it
We also see some of the lessons from Strixhaven: School of Mages , and one-off designs
We can say the same about combo Extirpate with any other mill source, very powerful
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According to an article on Magic: The Gatherings website, Jace, the Mind Sculptors ultimate loyalty ability was originally going to cost -8 life instead of -12