28 cards where the cards aren’t reprints and the card has the keyword “Horsemanship”

Herald of Hoofbeats (March of the Machine Commander #22)
Lu Xun, Scholar General (Portal Three Kingdoms #48)
Xiahou Dun, the One-Eyed (Portal Three Kingdoms #92)
Wu Scout (Portal Three Kingdoms #62)
Wei Scout (Portal Three Kingdoms #90)
Yuan Shao, the Indecisive (Portal Three Kingdoms #128)
Lu Bu, Master-at-Arms (Portal Three Kingdoms #115)
Wu Light Cavalry (Portal Three Kingdoms #60)
Guan Yu, Sainted Warrior (Portal Three Kingdoms #6)
Yellow Scarves Cavalry (Portal Three Kingdoms #125)
Zhang Fei, Fierce Warrior (Portal Three Kingdoms #32)
Shu Cavalry (Portal Three Kingdoms #19)
Sun Ce, Young Conquerer (Portal Three Kingdoms #55)
Lady Zhurong, Warrior Queen (Portal Three Kingdoms #139)
Wei Night Raiders (Portal Three Kingdoms #89)
Zhang He, Wei General (Portal Three Kingdoms #95)
Liu Bei, Lord of Shu (Portal Three Kingdoms #11)
Lu Meng, Wu General (Portal Three Kingdoms #46)
Zhao Zilong, Tiger General (Portal Three Kingdoms #33)
Cao Ren, Wei Commander (Portal Three Kingdoms #69)
Ma Chao, Western Warrior (Portal Three Kingdoms #116)
Shu General (Portal Three Kingdoms #25)
Wu Elite Cavalry (Portal Three Kingdoms #58)
Wei Strike Force (Portal Three Kingdoms #91)
Barbarian General (Portal Three Kingdoms #100)
Shu Elite Companions (Portal Three Kingdoms #21)
Wei Elite Companions (Portal Three Kingdoms #87)
Yellow Scarves General (Portal Three Kingdoms #126)

Though this query has ended, its relics still slumber in New Argive.