Quest Rogue is one of the most infamous decks to ever be in the Hearthstone meta. It had a period of dominance when it was first discovered, but was soon nerfed and largely unplayed. It again popped up in The Witchwood expansion and got another nerf! It represents one of the very few times that a deck required being nerfed twice.
The Boomsday Project brought just about nothing to the deck, but it did give it Giggling Inventor which is getting slotted into just about every deck right now. It spawns itself plus two 1/2 Mech tokens. If you’ve triggered your quest, then this is three 4/4 minions on the board for 5-mana, plus two of them have taunt and divine shield!