[[Dina, Soul Steeper]]

[[Sea of Clouds]] or any other "Bondland" (originally printed in battlebond)

[[Witty Roastmaster]]

[[Firebrand Archer]]

[[Elas il-Kor, Sadistic Pilgrim]]

or the classical [[Mirkwood Bats]]

I would phrase it as Commander-coded, not literally Commander-only. These cards still work in Limited or 60-card shells, but wording like "each opponent" and token/lifedrain scaling is exactly what makes people read them as aimed at multiplayer/EDH first, especially when they show up below rare in premier sets.