Topaz will either give you 10 passes or 50equus.
Topaz  ~  Topaz  ~ Topaz ~  

Xanthos gives ten energy points for your youngest horse, or most recently born. If you're lucky, you could win a Horn of Plenty.
Xanthos ~  Xanthos ~ Xanthos ~ Xanthos ~ https://www.howrse.co.uk/elevage/fiche/?id=8450117

You can defrost Frost here and maybe win a hypnose blanket:

https://www.howrse.co.uk/elevage/fiche/?id=7992959

You can make Archimedes more intelligent here and win an ageing point:

https://www.howrse.co.uk/elevage/fiche/?id=8021308&message=intelligence-plus