Give it a model which actually represents its speed and maneuverability.
I suggest the model of this beatiful steed this green knight here is riding:
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loginEdit: seriously, if I think anythig should get nerfed on the basically heavily UP horses, it's maneuverability. No horse should have above 43 or 44. It allows ridiculous actions. No neet to reward such an item with a new model, potentially even increasing its usage on the servers.