14 cards where it’s legal in Commander and the color identity ≤ BR and the card types include “planeswalker” and (the text includes “damage to you” or (the text includes “lose” and the text includes “life”))

Angrath, the Flame-Chained (Rivals of Ixalan #152)
Chandra, Awakened Inferno (Commander Masters #875)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (Magic Origins #135)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (Magic Origins #135)
Liliana, Death Mage (Core Set 2021 #328)
Liliana, the Necromancer (Core Set 2019 #291)
Liliana, Untouched by Death (Core Set 2019 #106)
Liliana, Waker of the Dead (Core Set 2021 #108)
Lolth, Spider Queen (Adventures in the Forgotten Realms #112)
Ob Nixilis of the Black Oath (Commander Masters #176)
Ob Nixilis Reignited (Duskmourn: House of Horror Commander #152)
Ob Nixilis, the Adversary (Streets of New Capenna #206)
Professor Onyx (Duskmourn: House of Horror Commander #153)
Sorin the Mirthless (Innistrad: Crimson Vow #131)
Vraska, Betrayal's Sting (Phyrexia: All Will Be One #115)

This search is finished. Now the real work can begin.