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And there is of
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synergy [Toadfish, Freeze + Shockwave]
I personally think that the upgraded is really OP. Usually with additional "DR", cost goes up by at least 1. But since this is an offensive shield and considering that Airborne creatures are frail, save for FFQ and a few dragons, I'd consider having it only deal 1 damage like it's unupgraded counter part, but either:
A) Lower Playing Cost to 4
B) Lower Ability Cost to 1
This will provide incentive to upgrade while keeping it relatively balanced in my opinion.