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4x Namaan's chariots
When there's a key character I want to get fast, I find myself putting 2 in the main deck, 1 in Reserve and then having 1 (if not 2) Deceivers in the main deck. That gives me an extra chance to get to that character without having to put 4 copies in the main deck (when I can only use one at a time). I think I would try to get 1 or 2 Moabite Marauders in there as well.
I would say Balaam's disobedience x 4 however there is that risk of coliseum , the Strong Angel (ROJ) , facing silver brigade and the 2 symbolic heroes. If you don't feel you will come across these cards often , then Balaam's disobedience x 4 would be pretty good.Thinking Naaman 1 or 2 should be in there as well depending on how many O.T gray brigade battle winner enhancements you have in your defense.
Old school Job's Wife would also be pretty good with both Disobedience and Teaching.