Just out of interest, what was the Razormane for? I really like your MB but a couple of your SB choices have me scratching my head? I'm guessing the single Tabernacle was an availability issue? (I like 2 or even 3)
I really like Razormane, he is an absolute beast in many situations, especially the MUD mirror. The lightning bolt effect is really good at killing most threats from your opponent (Metalworker, Lodestone, Revoker etc) and unlike lightning bolt is not completely dead against Wurmcoil Engine as you can bolt it and then they have to weigh up the benefits of blocking your guy and you slicing their Wurm in two due to first strike. He can also handle multiple threats and survive due to the combination of Bolt and first strike 5 damage. He is also easier to cast vs creature decks (where he also shines); decks like white trash can give you a bit of a hard time reaching six mana due to their nine strip effects. He is not always in the deck and you never want to draw more than one but he has some serious upside when he his play in certain scenarios.
Plus he is an out to Trygon Predator whom this deck is seriously weak to.
I only had access to only one Tabernacle but I have never really ran more than the one. It's a nice card to have and complements Tangle Wire really well at slowing your opponents down but having to or three risks having multiple in an otherwise good hand which I don't really like. It does not have a Trinisphere like effect in that you are willing to draw the dead ones because getting the live ones down is so important. I like to think it complements the man denial aspects rather than battling the creatures as such. Thats what I bring the Wurmcoils/Razormane and Mazes for.