For my Commander challenge, I like to grab a random legendary creature (or a planeswalker with the text that it can be used as a Commander)
You can do other neat things with it too of course, like tap down your opponents stuff, or get inspired triggers with Arbiter of the Ideal, or maybe tap your Winter Orb the turn before yours so all your lands untap
Eminence also works straight from the command zone, meaning you dont need to have Inalla in play to use them to combo off
They should be happy they get to salvage some junk
They interact with the graveyard immediately
Shock lands Hurts so good Hallowed Fountain, Watery Grave, Blood Crypt, Stomping Ground, Temple Garden, Godless Shrine, Steam Vents, Overgrown Tomb, Sacred Foundry and Breeding Pool are all two-colour lands that come in tapped if you dont pay two life