The only Boomsday card added is Storm Chaser because it guarantees to draw Bloodlust. If you ask why there isn’t the quest in the decklist, it’s because having one more card in the starting hand is very important in a midrange / aggro deck. The point of this deck is to simply win on turn 5.
For example you start with Murloc Tidecaller on 1 into Murloc Tidehunter on 2 then Murloc Warleader on 3 into Storm Chaser on 4, having a guaranteed Bloodlust on 5.















