Yes, indeed, you are correct on all counts. I think I am more generously interpreting "whenever you activate one or more creatures block" as "whenever you activ

Yes, indeed, you are correct on all counts. I think I am more generously interpreting "whenever you activate one or more creatures block" as "whenever you activate one or more creature's block" as "whenever you block with a creature." In this sense, it is very close to grammatical even if it is not close to the ruleset, and imho it is close enough that it could be playable in a casual game, which is really the litmus I am using. Instead of, "is this convincing as a magic card," I am considering "is there a way that this card could be made to work in a casual game, and still be both balanced and understandable"