This is how the card works:

You shuffle the last spark before your hero power changes. This card makes you draw a fatigue card after its casts itsself, killing your opponent, but only if they have no armor left. The passic power makes it that you can make your opponent draw the bombs you shuffle in directly, making the bombs more predictable. You can shuffle cards into your own deck, they will be draw also. This makes a fatigue warrior with bombs powerfull, but not overpowerd. The game can end with the first fatigue card your opponent draws or even faster, but for the passiv to make sense you need to play the bomb-shuffler-card after dr.boom, green horror.