Due to planeswalkers being so great almost all of these will have some Duress targets but the problem is that you don't have good odds on getting a hit, even on turn one, making Duress a bit dodgy
Lone Riders last ability wont trigger if you havent, even if an ability triggering at the same time will cause you to gain life
See Simulacrum Synthesizer, Foundry Inspector, and Urza's Saga as across the board, great with artifacts
In short, newer players may feel out of their depth, or more experienced players may want to just have a more unpredictable, casual game where neither player knows what cards theyll get in advance
Recommended Commanders: Muldrotha, the Gravetide, Orvar, the All-Form, Zur, Eternal Schemer Fractured Identity This is one of my favorite removal spells in Commander and Vintage Cube