Elf (Wing) & Orc (Krag)

I don't think Cold combined with Chaos will work well; Light is better because it allows you to apply stronger buffs to your powerful armies. I'm not sure; this is my first late-game match against an Orc.

If you have a spell that prevents chilling, then it will work. Especially in combination with a ballista, which can be upgraded since you have a Mentor. Let me explain: you fire a barrage of arrows at four cursed enemies, and not only do you reduce their rage, but the damage also increases by almost twice. However, this will be expensive if you take a ballista, and then you'll also need Empathy, as practice shows.
Plus, you can destroy his ballista with Cold.