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Tromell, Seymour's Butler Tromell, Seymour's Butlers proliferate X ability is too good to ignore

You'll get any nontoken permanents your opponents sacrifice or discard

If a Mountain you control leaves the battlefield between the time Valakut's second ability triggers and the time it resolves, be aware of whether that was the Mountain that caused Valakut's ability to trigger or not

Reference Card

One thing to keep in mind with the Retro Artifacts is that constructed playable is not the same as limited playable

Then, on your next turn, you can simply play Stasis again to avoid dealing with the negatives yourself