Hello!
When browsing my collection, I would like to have a way to limit my search to ONLY cards that are multi-class (the new dual class cards, and/or Gadzedzan’s tri-class cards. Or to ONLY cards that are single-class.
I checked the keyword list at https://hearthstone.gamepedia.com/Collection_manager#Keywords but that page has no recent changes.
I tried a few choices myself but could not find any (though the three tribe names of Gadgedzan do appear to work).
Does anyone know if there are any keywords I can used for this?
Unfortunately the HS team has neglected the collection manager, they still need to fix the “demon” or “hunter” search parameter so you dont get all of the demon hunter cards.
Best method I’ve found getting around this is either just filter by scholomance or search a class (or do both to make it easier), for example if you making damage deck searching shaman will show all the mage-shaman cards, only downside is you will get cards that say to discover a card from a specific class, searching mage will get you a lot of result since there are a lot of “discover a mage (spell/minion)” type cards
In a recent AMA the Hearthstone team told people that they’re probably going to make more Dual-Class cards, so it’s very likely the collection manager will get a fix for them.
As for the “Hunter & Demon Hunter” issue, I hope they fix that somehow.
Why? More options is always better, but I was genuinely curious as to why you’d want to do this?
I have a spreadsheet where I track how complete (or rather, how incomplete) my collection is. Keeping it up to date after opening packs used to be rather simple, as I can just count the cards by expansion, class, and rarity. Now the same card shows up in two or (Gadgedzan) three classes and I need to avoid double counting.
The Gadzedzan cards are actually still relatively easy to process, since their tribe icon makes them easy to recognize. I skip them when counting the class cards, and I later use the tribe name to count the multi-class cards that I track in a separate column now.
The dual-class cards are much harder to visually recognize (especially when I am counting missing rather than owned cards), so it’s hard to skip them when counting class cards. And there’s no easy way to find them when I want to count my dual-class cards.
Having keywords to select multi-class (or dual-class) only, or to select single-class only, would make my life a lot easier!
(Granted, for gameplay and deck-building purposes there is little benefit to this. But then, what is the gameplay / deckbuilding benefit of “Owned:4-7” or “Artist:Dixon”?)
Fair enough. I can’t see them doing it, as that’s a super niche reason and I imagine it’d require them reworking some stuff, as my guess is in the collection they’re just duplicates because there is no card count.
That would actually probably be a better thing to ask for. A collection completion page, making your spreadsheet redundant 
If your on pc may I suggest a helpful application called “Firestone”, it’s an addon from overwolf, it’s very handy as tracks progress, chances for next rare and legendary drops and acts as a deck tracker, best of all it auto launches on startup unlike hsreplay (if it did I missed that option)