I have been experimenting with the idea of learning Urbit through Anki. No useful decks published yet. Hoon has a complex set of runes (~& |- $_ ++) and several rich vocabularies of three and four letter words, and for the most part it's made by one man.

These (unique?) properties make Hoon language a prime target for an Anki deck. Programmers learning languages with less byzantine syntax (like Javascript, or even Brainfuck) might not benefit much from Pauker-style study and deck creation.