Across all the types of cards you'll want to include, there is a "meta-class" of cards that can guide you: Commander staples
On the other hand, there are several reasons to think that Umezawa's Jitte would be fine in Modern
Halo foil returns from March of the Machine : the 43 cards with planar Booster Fun treatments appear with Halo foil versions in addition to their traditional foil versions
I offer several replacements for Rift in my Replacements for Commander Staples article, all of which are also significantly cheaper
Designer Notes: The deck plays a ton of "comes into play" effects so you can get maximum value from your commander
With a Stranger Things vibe and some genuinely unsettling art, Duskmourn is looking to tap into a niche that the MTG universe has rarely investigated directly, choosing to include hints of horror (like Eldrazi transformations) or more traditional fantasy scares (think Innistrad - before the Eldrazi, anyways)