Probably been suggested before, but I'll leave this here: make undiscovered tags stand out in some way when you hover over them. The jokers and vouchers and stuff say "undiscovered", but the tags don't have any indication (that I can tell) that you haven't discovered them, so it's just a guessing game as to what tags you need unless you look them up online. I don't see an issue with using the "undiscovered" text like the jokers and stuff, but if that wouldn't work, use something else to indicate it
#Tags
inner dust
grizzled raft
hmmm