First test of the deck tonight was hysterical, went 3-0, losing only one game.  Was able to stall out damage for long enough to pop ultimates on one or both PW almost every game.  Only game I lost I simply didn't draw enough fogs and lost to white weenie.  Overall highly amusing night of play.  Not the solid in-your-face beatdown of the zombie deck, but fun nonetheless.

Would it be worth making room for 2-3 Reliquary Tower, or is discarding your own cards (say off the Atlas) not a real problem?

yeah, I might need to add more witchbanes in main deck, I have the in the sideboard

Looks interesting Chuck.  I see the weakness of this deck would be red burn, since the damage prevention is primarily combat damage.  With only one witchbane orb, it will be tough getting it on the battlefield, and hope they don't have artifact removal.