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Artifact milling cards are almost always tapping artifacts that repeatedly mill the opponent

This nearly doubles the 34 commanders from Murders At Karlov Manor (which includes the legends in the MKM Commander decks)

I would be happy to see it come back in a future Ravnica set, along with most of the other guild mechanics which all added a nice dynamic to the plane

Reanimator effects are incredibly powerful in the Commander format

If you open a Japanese Collector booster, any Showcase cards you open will be Japanese

As you would expect with any gradual changes in a complex meta or ecosystem there are multiple factors at play