The tasks in Mercenaries actually start giving quite big rewards later on, definitely worth farming from Mysterious Strangers beyound the item at 7! : r/hearthstone
Dr. Boom Puzzle Lab Solutions Guide - Dr. Boom Puzzles List, Answers, & Tips - Hearthstone Top Decks
Announcing: The Boomsday Project - Hearthstone
Hearthstone: The Boomsday Project's solo mode features more than 100 diabolical puzzles | PC Gamer
Brian Kibler on Twitter: "Hit Legend again pretty quickly playing only No-Deck Warlock - same list as last month. Went 29-19 overall. https://t.co/UPFxSrOryx" / Twitter