You can't get any DPS skills off class as a WAR other than Internal Release.

As an MRD you would have acces to:

Straight Shot
Raging Strikes
Blood for blood
Invigorate (if necessary)
And Quelling Strikes (which would be necessary if you were going for max DPS using Butcher's Block combo)

Honestly, if you've got Bravura it may not be worth it to switch to MRD given you would lose a decent chunk of weapon damage and primary stats. And leveling to lnc 34 just to get blood for blood would be a little excessive.

As a MRD dps you would basically be trying to roll as many buffs as you could. The biggest thing you would get from off-class would be Straight Shot. Rotation would change to something like:

Straight Shot -> Heavy Swing -> Maim -> Storm's Eye -> Fracture -> Heavy Swing -> Maim -> Storm's Eye -> Straight shot

You could potentially work in some butcher's Block combos in there if you had quelling strikes, but the probability of pulling aggro would be pretty high I think.