I've been working on one of these myself (my latest project). And I must say, based on my experience, Pyre Zombie is really, REALLY, _REALLY_ good. Like, slightly bent good. REALLY good. I know he's probably better in my version than in either Gizmo's or Caveman's, but he's like playing a whole big pile of Shocks. He acts like a Hammer that can block, which is never something to be ignored.
My version of B/R, aka 'How To Play With Way Too Much Removal'
Removal Spells
4 Shock
4 Seal of Fire
3 Urza's Rage
4 Scorching Lava
4 Seal of Doom
1 Void
3 Mage's Contest
1 Hammer
Creatures
1 Tsabo Tavoc
4 Pyre Zombie
1 Necrosavant
2 Chilling Apparition
1 Skizzik
2 Blazing Specter
Other
1 Tsabo's Web
1 Vampiric Tutor
Land
4 R/B Duals (Urborg Volcano)
4 R/B Pains (Sulferous Spring)
Basic land to taste
Yes, it looks quite random. The creature list is a bit odd right now (lots of one-of's), but that's for testing purposes. (What creature do I want now? Add more. What creature don't I want now? Remove some. Etc.) I'm still working on that. But, put simply, this deck WRECKS counter decks, Nether-Go, and Stampy. Obliterate wrecks this deck (working on that), and WW is a bit of a problem. Predator is a card I'm trying to make room for, since it'll beat all the Pro-creatures around right now.
But Pyre Zombie is AMAZING. I play one, and from that point on, I often don't really need any other spells. I still use 'em, but often enough, I would be able to win without them. The Zombie just wrecks house on Blue and Green, and the burn added in only aggravates the problem those decks have against this one. The Zombie also lets the deck survive even if its attack phase gets shut down by a powered Collective Restraint. It's more impressive than it looks, and I have nothing but good things to say about it so far. (Yeah, there's Hammer. But it's not nearly as versitile, and creatures right now tend to be X/2 or X/4, neither of which the Hammer is well suited to.)
(As a secondary issue, what does everyone think of Blazing Specter?)