Spellblade support and Heralds

Spellblade support does not work with Herald due to being Added spell damage. This is expected, though disappointing.
The issue is, the support shows that it can support heralds, and increases the mana cost despite not functioning due to the herald restrictions on spell damage modifiers.

I think either the support should work with Heralds or the support should not be able to support them at all.

I hope that Heralds gets some love here that they desperately need, but either way it will be a more clear experience.