May I suggest to cut back on creatures slightly and fit in a few copies of Lightning? With this setup, you need Dimensional Shield less to win, and Bronze decks usually have at least some PC. With your version, seeing Pulvy or an SoSe'd Butterfly Effect is essentially GG.
Shard of Divinity doesn't seem very useful. Shard of Sacrifice, on the other hand, would be very fun if you have it...
Phase Dragons are good cards to upgrade, because of the +2 damage boost. I'm not sure, but I think that would help more than +1 quanta.