A perfect evil counter to horses, favoured by Humans, is wolves or wargs. Goblins and Orcs can use these to similar advantage, including speed and height advantage. The wolves themselves are powerful weapons in their own right as well.
25mm scale rubber moulds that can cast multiple figures hundreds of times.
There is on Wolf and two different riders that you can cast and you can cast approximately 5 mounted figures from a single ingot of metal (e.g. Model Metal ingot is 125 grams) provided you remelt the ingates between casting.