Cool, cool. Was actually recently thinking of a need for an "other" shield. A little expensive for the upgrade to play, but worth it being that it can fit in any deck that cant use an elemental shield with damage resistance if needed and can also replace elemental shields to make a deck less heavy on that element. I ran into a similar problem when I tried using Diamond Shield in my Heavy Metal deck, "Heal and Protect." Having the choice between it and Gravity Shield, Gravity Shield was the better option in cost, but I would have preferred numerically damage resistance, and that would make the deck just a tad Earth heavy for my taste.
The unupgrade could use a cost raise, if I am correct it makes a lot of shields obsolete. I suggest it being 3 or 4.
EDIT: actually it just makes the Skull shields obsolete, being that they are 3 | 2 and both only block 1.