I like it much. It can protect pilars from earthquakes and shard stacks, weapons and shields from explotions and steals as it can make oponent's perms unusable. The only thing i don't like much is that there aren't sooo many actuve skilled permanents to be used as PC. I mean: Hourglasses, Eternity, Pulvy, Eagle Eye, UG, Catapult, and sundial (ok, no one would use this on a sundial). The pro thing about PC is that, if it works, you entirely break the oponent's deck strategy.
Conclution: Armory please!