I've had various minor issues figuring out how to combine tools.deps, figwheel-main, devcards, emacs/CIDER and Clojars, and got a lot of help in here, and now I've summarized my experience in a howto on configuring this combination: https://cjohansen.no/tools-deps-figwheel-main-devcards-emacs/

hope it can be of use to someone