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I think immune/ignore will only apply across alignment when all is said and done, but the other cards will be flexible in their application (those which are not already ruled so).
But that wouldn't make any sense. How do you resolve one Hero ignoring your other Heroes? Does it force them to leave at the end of battle, like ECs? What if Asahel was Warrior Class himself? What do you do when you ignore yourself?I think limiting targets in that way would hamper the gameplay a lot more than it might conceivably help it.
I think at this point if Battle Prayer (Wa) was ruled by its original wording rather than the "play as", then we'd have consistency with the current card set.
Following that guideline, then...Nicolas of Antioch - Can search for good or evil enhancementsIsrael Pays Tribute - Can negate good or evil enhancements