After some discussion with the team, we feel it is best to move forward with option #1. A couple reasons behind our thinking:
1) this will be a promo that is widely available--particularly to new and younger players. These players may not fully understand Unity right away or how to build a deck around Unity abilities, but they will definitely want to use this awesome looking character in their deck.
2) there are still many Philistine characters that can be printed or reprinted with a Unity ability in the future (Lahmi certainly comes to mind) if we feel Philistines still need another strong character to make them standalone worthy.
3) CBN protection is something we do want to start moving away from in general. Even though this guy only protects others (and not even ones in battle), we maintain a slower power creep each time we restrain ourselves from slapping CBN on something.
I want to thank everyone who was involved with the creation of Rapha of Gath--I know I'm excited to get my hands on one!