If it's for Siege, I have a vendor where I sell fire steeds for 30k. When I'm playing there, I make it a habit to pull them until my stable is almost full. I cherry pick off the best ones for any builds I do. I've got a prototype of Mysticism/FWW/AI and a couple in the stables that are better than the vendor ones, if you want to meet up. That prototype is kind of interesting. I'm still trying to use mysticism on a pet and exploring/investigating that. I've got a mystic mare I'm training up, but the skill is still too low to see how I like it. Have a tmap hunter cu with mysticism that I really like.
If you're pulling from the brazier on Siege, I'd suggest building an anniversary horse. 3 slots at max level, and you can build them with Poisoning, Bleed, and Armor Ignore. You can probably do the same build with a frenzied, but I just like the colors of the anniversary horses. It's useful for culling nightmares too, since you can still tame a 2 slot nightmare as well. There's an old thread here with unusual/oddball pets posted to it and the build details are there.
I think you can clothing bless the Cu shoes on siege, or do the human to elf quest if you want to switch.