You Be the Casting Director!

Andy Samberg as Dack Fayden and Terry Crews as Teferi, ft. Ryan Reynolds as Tibalt. You know you want it to happen.

I feel like Keanu Reeves could do an interesting Jace, though with recent developments maybe Johnny Depp works a lot better.

Rowan Atkinson or Ioan Gruffudd as Gwafa Hazid, Profiteer.

@daij_Djan:  To paraphrase "Diamond" Joe Quimby: "He can be two things!"

Toby Jones or Jared Harris for Tawnos.

Does this mean that MaRo himself has nominated Paul Newman to portray Demonlord Belzenlok?

I don't really care about actors not looking anything like the part they're playing as long as they can act it out well and it doesn't stifle representation which is already canon (ie making Teferi or Saheeli white, things like that).

Peter Capaldi as Urza would be interesting. I think he could pull that off.

Melissa Marsala as whatever, just put her in the film, Jacqui needs to be appeased.

I don't follow many actors' carreers so I can't comment on most choices other people made in this thread but I'm skeptical about Jennifer Lawrence as Jhoira (I'd rather they picked someone who could be funny but also more intimidating, perhaps like Maggie Smith but younger, I can't think of any examples though; or perhaps someone like Claire Foy) and I think Terry Crews as Militia Bugler would be basically a cameo role and thus not really worth it, if they put him in the film he'd be better in a more prominent role imo, I'm sure they could find other actors for the Bugler.

Hugh Jackman as Garruk Wildspeaker

Paget Brewster as Wandering Mage, in a bit of a convoluted nod to Harvey Birdman, Attorney at Law & Phelddagrif (Peter Potamus is Phelddagrif).

So, this art suggests Michael Ealy for beefslabGideon

Klaus Nomi as Ashford Lawrence.