mtg warhammer 40k commander deck lists MTG: The Decks, Ranked My 79th Commander Deck is

And the stats plus keywords will support a Sacrifice deck nicely through Deathtouch and Lifelink

Be sure to have a Guilty Conscience attached to Spiteful Sliver while Sliver Hivelord is out

As for Universes Within, there are great decks from Tarkir Dragonstorm, Modern Horizons 3, Bloomburrow, and Januarys Lorwyn Eclipsed - nice

I think how you handle selling your cards really depends on WHAT you have to sell and ensuring you choose places that will get your collection in front of the right buyers

Read ahead lets you skip straight to a Rise from the Grave if needed, but if you have time along the way, you can cash in on a Grim Tutor or even some hand disruption