All I have is a placeholder until I get some 2/3 step worked out. I am a frost dk in frost presence. They changed it so if you are frost you use frost presence now.

A macro in slot MultiBarRightButton1 for trinkets (remove # for "on use" trinkets)
/startattack
#/use 13
#/use 14
/cast Anti-Magic Shell
/cast Icebound Fortitude
/cast Pillar of Frost
/cast Lifeblood
Then this is the spamable macro that calls the above.
/Click MultiBarRightButton1
/castsequence reset=6/combat Howling Blast, Plague Strike, Obliterate
/cast Unholy Blight