30 cards where the illustration contains “black-horse”

Adeline, Resplendent Cathar (Innistrad: Double Feature #1)
Barbed Foliage (Mirage #207)
Bequeathal (Exodus #106)
Black Knight (Limited Edition Alpha #94)
Call the Bloodline (Friday Night Magic 2016 #12)
Cavalry Drillmaster (Core Set 2019 #8)
Clarion Cathars (Innistrad: Midnight Hunt #14)
Courageous Outrider (Eldritch Moon #18)
Devoted Paladin (Adventures in the Forgotten Realms #11)
Ebony Horse (Arabian Nights #62)
Headless Horseman (Legends #102)
Iridescent Angel (From the Vault: Angels #10)

This card does not meet Magic community standards.

Jihad (Arabian Nights #5)
Knight (Time Spiral Remastered Tokens #5)
Locthwain Paladin (Throne of Eldraine #93)
Midnight Reaper (Secret Lair Drop #1171)
Moorland Rescuer (Midnight Hunt Commander #7)
Nightmare (Magic 2014 #108)
Nightmare (Seventh Edition #150)
Nightmare (Limited Edition Alpha #118)
Order of the White Shield (Ice Age #46)
Outrider en-Kor (Time Spiral #31)
Seasoned Marshal (Seventh Edition #40)
Seasoned Marshal (Portal #26)
Shu Elite Companions (Portal Three Kingdoms #21)
Whirling Dervish (Junior Super Series #15)
Yellow Scarves General (Portal Three Kingdoms #126)
Zhalfirin Commander (Mirage #49)
Zhang Fei, Fierce Warrior (Masters Edition III #28)
Zombie Knight (Dominaria Tokens #5)

The message was clear to Sorin—time to search for something else.