Here is the repository for it. My wife tried using it to no avail. It does not convert the text to an image. Either that, or this plugin I based it off from cannot change some text e.g. [m08] (meaning, major arcana number 8) into an image:
I would have her use the built-in custom emoji uploader but it shrinks the image; undesired. Any helps are appreciated.
I’d guess that today that would rather get turned into a theme component; it doesn’t actually need to be a plugin, because it has no server-side logic. Likely same for your tarot project; I don’t think it needs to actually be a plugin.