I tried the above first thing this morning without the nil value and it works once I adjusted the commas with the one issue of it is not casting on the last toon, so I get 4 toons all with shield but it is not casting on the 5th, not sure why, but did not have enough time to really troubleshoot it.
I looked at the original thread which Ualaa listed and used the code at the end of it which is pretty much the code above without nil value.
I think I am close to getting it to work ,but not 100% there, btw this was working using click macro setup with the above issue.