Sacred Sanctuary seems pretty fair. As Air you're competing with a free fate, but I imagine it pays for itself when you get to ready and reuse a monk. At worst, you probably have a 2-strength monk around that can defend without bowing that makes up for its low province strength, but unless you're readying someone sometimes or reusing a high-cost monk, you'd rather get the fate from Manicured Gardens.
But those are pretty easy conditions to fulfill. I like it a lot.
