Shadow/Nature - they both seem to have decent dom teams that have the same issues (bigger flights, more casual/non-dom players) so it seems like a fair match

Nature/Arcane or Shadow/Arcane - might work too but Arcane was a little disorganized in this battle so idk

Wind/Nature - they seem well matched; Wind is probs stronger but I doubt it'd be a noflip

Plague/Ice/Light/Earth/Water - tbh I think any match up from these five would be a battle worth watching; Water noflipped Ice twice so maybe not that particular one.