Maybe consider upping cost slightly, on the upped By 1 at most. Overall I like this card and would use it if I ever made a deck around .
I see no reason to up cost.
I said this because you can make it un targetable for a turn. Seraph costs 9 for a 12|1, figure dropping the attack to 7 and bumping the HP to 1 it should at least cost 5.
Also Phase Recluse has the web ability. Which has nothing to do with this kind of mechanic.