Flanking is a mechanic introduced in Mirage that has a very similar flavor to horsemanship since it most frequently appears on cards featuring warriors on horseback, but the two mechanics are very mechanically distinct
We could try playing cards like Thrill of Possibility to fill the yard faster, but that would leave us with even fewer chances to defend ourselves or pressure controlling decks

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While there are some Commander applications with the Avatar Horror, the card is seeing the most play in Standard within Four-Color Zur and Domain Ramp, which uses Zur, Eternal Schemer to give your Overlord cards deathouch, lifelink, and hexproof
I hope you will make it to a very old age so that you have time for them all