Any Hero cards not allowed if using battlesite?

[Wolverine1]

I have seen it alluded to, but never specifically stated anywhere or perhaps I am just misunderstanding.
Is there a rule that you cannot use Any Hero special cards in your deck if you are playing with a battlesite and activators?

[steve2275]

one or the other
always been that way

[chuu]

Yes it's an official rule.

[Wolverine1]

Excellent, thanks. The whole battlesite mechanic is silly anyway. This makes it easier for my deckbuilding.

[Majestic]

We've been playing with both the entire time (battlesites with activators along with Any Hero/Any Character Specials), being as there is nothing in the rules that precludes this.

Curious where anyone ever came up with such a ruling from, as it doesn't appear to be in any version of the rulebook.