If Seal of Command causes the global cooldown, then Blessing of Might can't be cast.
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
yea it does require a global cool down...but i remeber way in the past there was a way to make the macro wait like 5sec and cast the next spell on the list
I think those macros were killed when BC went live. The best you can do now is use Castsequence I think it was. Blizz has made it so that you will have to press the key multiple times....ie "One key press, one action".
So I believe your macro should look like this now and do everything by pressing the key twice:
/castsequence Seal of Command, Blessing of Might