I just wonder if something like this wouldn't be better?
/castrandom holy shield,
/castrandom concecration,
/castsequence or random bla,bla,bla
/use 13
/use 14

I personally use
/castrandom holy shield,
/castrandom bla, bla, bla
/use 13
/use 14
and have concecrate on another botton.