Now with the campaign, it’s ever more important to have an indication of which troops drop from which chests and which don’t drop at all. In-game. Don’t really care where but i suggest on all unowned troops (extra icon or whatever indicating from which chest it drops). Another way is simply in the chest menu, like the drop rates. Also, if it doesn’t drop from chests yet, there should be a “release date” for when it gets added.
It’s really frustrating to blast through keys when suddenly rumours say the troop isn’t even in the drop table yet. I spent all my Vault keys last week after the event because the Heart of Rage suddenly appeared in my unowned list, assuming it was dropping. Well, i now hear that it doesn’t yet (can you confirm?). Amazing.