mission rewards seem to be available in vendors : r/Wonderlands
Deathrattlin' Decorations - Descent of Dragons Hearthstone Decks - Out of Cards
Decorated Dalaran - Hearthstone Cards - Out of Cards
Brewfest Spotlight: The Inns of Azeroth - Wowhead News
Tavern Brawl - Decorating Dalaran! - Hearthstone Top Decks
Decorating Dalaran is the first Tavern Brawl of Hearthstone's latest expansion, Descent of Dragons - Dot Esports
With no free Heroic Brawliseum run, The Forbidden Library "event" nets zero extra resources for players compared to the typical weekly brawl schedule : r/hearthstone