Jace's Defeat: It belongs in the sideboard, and against a deck playing Jace, the Mind Sculptor in Vintage and Legacy, it's a four-of in the main deck
She costs two ink to play so you could potentially play her early on however you will want to wait until your opponent is ahead on lore to make use of her ability NOT FOR YOU
You're "wearing a hat" if you're wearing a hat
Whether as your commander or not, you can run him alongside various LhurgoyfLhurgoyfs that love seeing full graveyards: PolygoyfPolygoyf, BarrowgoyfBarrowgoyf, and NecrogoyfNecrogoyf are all great candidates
It gets better in a world where you have ways to take more advantage of oil counters too
Being able to play it as a creature board wipe in the late game when you don't need more lands is awesome, provided that you have a legendary artifact on hand to sacrifice