I would just make it 10 shields and any tier of the player to upgrade to a guaranteed 40. It would be similar "cost" to H2H in that way.
Great idea. It would address another huge set gap in the game.
Quote from PASKI >> Stop the shields and drop the 40 Power, thats enough....
Realistically they won't do that, but I'd exchange my Tier 3 Metcalf + 10 shields for a Tier 4 Metcalf. And that price is fairly steep. Just an idea.
Exchange Set 10 shields + Tier 2/3 Phenom for a Tier 4 Phenom
Basically you can get yourself a Tier 4 for 15 shields