u/BrandonFranklin--

Not a land as a commander, but each player gets a basic land they can play from the command zone.

We tried this a couple games after some particularly unlucky mulligans and it was surprisingly effective at just letting people not think about the hand they keep as much. There's a bit of a choice to make for multi-colored that seemed interesting to build around, and it definitely alleviates the desire to mulligan a pretty good hand just because you're worried about manascrew.

Not sure if we're going to stick to it, but am curious if anyone already does this or if it's already a niche house rule that's well known.