The Commander: Phelddagrif
The Basics: Unhinged

The Commanders: Nikara and Yannik
The Basics: XLN Standard Showdown

The Commander: Borborygmos Enraged
The Basics: 7th Edition

The Commanders: Tevesh Szat and Nadier
The Basics: Invasion

The Commander: Orvar
The Basics: 5th Edition

The Commander: Sidisi, Brood Tyrant
The Basics: Unstable

The Commander: Princess Twilight Sparkle
The Basics: Mirage

The Commander: Rakdos, Lord of Riots, by @derfington
The Basics: Theros Beyond Death

The Commander: Dalakos
The Basics: Dominaria, M12

This one seems weird, but there are reasons:

The THB lands don't fit this deck's budget, so I had to stray. From there: He's a merfolk, I like this Mountain, and I love the monochromatic, saturated palettes in both cards.

The Commander: Riku (of Seven Dwarves)
The Basics: Foil Throne of Eldraine

The Commander: Mangara, The Diplomat
The Basics: Snow-Covered Ice Age

The Commanders: Akroma and Rograkh
The Basics: Commander Legends

I played this deck on the CMR #GameKnights, so if it was printed in Commander Legends, it's in a Commander Legends frame. If not, I used Commander product printings wherever possible.

The Commander: Kenrith, Returned King
The Basics: Double Masters (John Avon)

The Commander: Atla Palani
The Basics: Currently Foil Kaladesh (just what I liked and had lying around), but upgrading to Jumpstart!

The Commander: Azusa
The Basics: Ice Age, Snow & No Snow

(Field of the Dead reasons)

The Commander: Niv-Mizzet, Parun (Dragon’s Approach)
The Basics: Strixhaven

What? Maybe he has an Adjunct Professor position?