But why would you need a shield? To farm AI3 PVP1, you do not need shields or any kind of defense for that matter, only attack, turning all shields pretty useless. And the only thing this deck does NOT lack is attack.
And if you would allow me, nightfalled fractaled deathstalkers is much better for poison dealing. This one does great, and the momentum is pretty nice, but a twist with adrenaline would be better then TU's.
Edit : I changed the AI part, but the same holds true. Very little decks in PVP1 need any kind of real defense again. And even if you needed, the available shields here (Gravity and Phase are out of the question), leaving only Skull Shield that blocks for 1 damage. If you twisted to adrenaline, thorn shield would be much more used. As in, there is no needs for shields here ATM...