This card is based on the knight piece of Shogi, known as "Keima". "K" is pronounced "Kei" in Japanese, and "horse" can be read as "ma" (馬); hence, "K Horse" is a pun on "Keima".
Also, the piece's Japanese name can be translated to "cassia horse", reflecting this card's body being that of a horse.
The movement of Keima is restricted to moving 2 squares forward followed by 1 square sideways. If moved as such on the game mat, this will bring the card to an opponent's Spell & Trap Card Zone adjacent to the monster's initial position, thus its manga's effect.
This monster's weapon could be a Zanbatō, Horse-Slaying Sword.