Wrath of God will serve you much better in this deck considering none of your creatures can regenerate.

You might also consider splashing blue for Supreme Verdict against control decks.

I also find that Martial Coup is a fun late game board wipe, as it leaves you with immediate board advantage.

Elspeth Tirel has a built in board wipe, although I'm not sure if her +1 would be relevant in a deck like this. It can be used the turn after she comes out, and she will live to talk about it.

Yeah, I really like Supreme Verdict and have thought about splashing blue for awhile. I think I may just create a separate deck with the splash and compare playtesting.

Martial Coup is quite nice and versatile, but the concept I want to follow is the assumption that all my permanents are indestructible anyway. So Wrath of God does the same for me and has a cheaper mana cost.