Relic of Progenitus has been one of the premium answers to some strategies: Its cheap, and can play a grindy game removing one card per turn, or one-shot-exiling both graveyards at the right time
While I have Lurrus as being one of the strongest, at least from a more comprehensive look at Magic, if I only looked at Commander, I would have picked Lutri, the Spellchaser, as it provided on-demand storm effect
Secret Lair is an extremely divisive aspect of Magic: The Gathering, largely due to the unnecessarily limited nature of its releases
Atemsis is another very playable card With a super-loot (draw two, discard one - thats card advantage), she can help set up a perfect hand
This even works when Cordial Vampire dies
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