Wither

[at94hiker]

Are there any ice heroes with wither?

[Spinach]

Ixinn, for one.

All enemies -450 atk

[Shohoku79]

For quick search about Hero cards based on element/abilities/rarity, Empuzzled (link in the top of the forum) provides a very updated, comprehensive and easy to use Hero Database and add in a few search filters to narrow down your search and arrive at your desired results.