I haven't seen anyone post a Muradin guide that I really liked and I only found a good build when I went on HOTSLOGS.com. If you play ETC, you are used to only grabbing block first ability and other guides on this site say that Infused Hammer is the right choice to keep your mana up, but no one talks about how strong Perfect Storm stacks become!!!

Perfect Storm stacks with every time you hit the opponent with a Q, in a long and competitive game this can add up to 200 extra damage per Q.

Standard Stack build

Pro:
Amazing Late
Able to Duel Carries late game
Great Sieging
Clears Camps Easy from Mid Game on

Con:
Only Utility is Q and Ult
Never Really Tanky until 20
Has to land (important) Q to be useful

-Don't jump into the 5 man team, even for one kill.
-Be smart about your mana.
-No one will call you a wimp for jumping out of a teamfight.
-Your passive reenter long teamfights, so don't get nuked.
-Every Q can save a teammate or get a kill, so hit them.