New player looking for feedback, this was once mono-white heroic but I'm leaning more towards other counter generation methods and Jeskai colours now.

Would like some tips for sideboard/ or any suggestions!

Ordeal of Heliod + Sunbond is attractive and horrific if the buffed creature gets temur battle rage, but strongly considering bringing in Jeskai Ascendancy - would this be a good move? A full play set? What should come out

I am too cheap for fetch lands/ mana confluence