29 cards where (the card is available on Paper) and it’s legal in Commander and (the rarity is equal to rare or the rarity is equal to mythic) and the USD price >= 30 and the language is Japanese

Archangel (Media Inserts #29)
Basri Ket (Planeswalker Championship Promos #2021-1)
Braids, Arisen Nightmare (Planeswalker Championship Promos #2023-4)
Chandra, Fire Artisan (War of the Spark Promos #119s★)
Demonic Tutor (Strixhaven Mystical Archive #90)
Elspeth Resplendent (Planeswalker Championship Promos #2023-1)
Elvish Champion (Japan Junior Tournament #2N08)
Experimental Frenzy (Planeswalker Championship Promos #2019-2)
Glorious Anthem (Japan Junior Tournament #1N08)
Goblin Mutant (Hobby Japan Promos #1)
Grand Master of Flowers (Planeswalker Championship Promos #2022-1)
Ihsan's Shade (Hobby Japan Promos #2)
Jace, Wielder of Mysteries (War of the Spark Promos #54s★)
Karn, the Great Creator (War of the Spark Promos #1s★)
Kaya the Inexorable (Planeswalker Championship Promos #2021-5)
Krovikan Vampire (Hobby Japan Promos #3)
Liliana, Dreadhorde General (War of the Spark #97★)
Liliana of the Veil (Planeswalker Championship Promos #2023-3)
Mad Auntie (Japan Junior Tournament #3N08)
Nicol Bolas (Magic × Duel Masters Promos #1)
Nissa, Who Shakes the World (War of the Spark Promos #169s★)
Saheeli, the Sun's Brilliance (Planeswalker Championship Promos #2024-05)
Serra Angel (Magic × Duel Masters Promos #3)
Tarmogoyf (30th Anniversary Play Promos #15)
Teferi's Protection (Strixhaven Mystical Archive #74)
Teferi, Time Raveler (War of the Spark Promos #221s★)
The Wandering Emperor (Planeswalker Championship Promos #2022-4)
Vivien, Champion of the Wilds (War of the Spark Promos #180s★)
Yavimaya Ants (Hobby Japan Promos #5)

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