I was first inspired by the Man O'War game having different chaos powers with different chaos rewards for each faction and first thought about making you pick between a slaanesh caster or a tzeentch caster and having different spells for each in warmaster.....something along those lines. Despite the fact that something along those lines would open up a huge can of possibilities and worms. I also really like the self destructive nature of the chaos magic in that game so I wanted to try for doing the same thing in warmaster, but again, huge can of worms and complexity.
I thought about pooling them all like that and having my opponent draw randomly for me but the unbalanced spells would be glaring, like "heavens fire" for chaos. Or maybe just pick 8 that I like from the entire rulebook of all races and THEN my opponent picks 4 randomly for me.
I think I just like making cards as that linen paper really turns out nice after a clear enamel is sprayed onto it

I will be making my brother some cards for his high elves and Empire armies next.