Hmm yes, shields will likely be a problem to this deck. Unfortunately the only things Life can do against shields is pray that they do damage faster, outstall it, or splash off-element PC in the deck.
That first tactic isn't going to work well against Wings and Dim Shields.
Second tactic requires you to make a fatter deck.
Third means that the rate you're able to play creatures and other Life cards is going to be slowed, which means that cards like Discord and Earthquake are going to be much more dangerous. But I guess the decision is ultimately between wanting to deal with Shields or wanting to be prone to those other cards. Also, you won't need to switch all of your Pillars to Pends for these cards since they don't cost more than 3-4 of their respective quanta.
One more thing:
-switch all your pends to pillars and get mark of and put in one or two butterfly effects
You can't target Frogs with Butterfly Effect, and I don't see the point of adding low attack creatures just for this reason.