testing this deck, considering what the best last 2 cards are. seems to lose to lifegain (sanct/sog/vampire) and purify. these tend to be long games, and as such shard of bravery isnt really solving the problem. shard of focus can counter the permanent-based lifegain in some cases, but the other two seem very difficult or impossible (further complicated by the fact that all good ideas are either too expensive or vulnerable to PC that has nothing else to target)
that said, it wins a lot and besides paying attention during a couple important turns...its not too hard to play correctly. refreshing break from mind bendingly nuanced decks