It's legit to combine the text of an open source license and the text of the Commons Clause. However, if you try to do that with e.g. the Apache License Version 2.0, the Apache Software Foundation won't let you abuse their registered trademark and call it "Apache 2.0 + Commons Clause", because the result is incompatible with the spirit of the Apache License 2.0.
I believe that similar reasoning would apply to the AGPL.
I believe that similar reasoning would apply to the AGPL.