Fire VS Water
Necrotic VS Holy
Toxic VS Electric
Gave theese damage types more power against their counter damage.
That would add more strategy to this game and make - for example - some heroes great again - when used as counters.
For example the new Angels (holy dmg) would add
against unholy heroes with necro dmg (for example dracul) and unholy heroes would also add +100% dmg against holy heroes.