Just playable. This is good buff for murloc-shaman, but this deck will not be a t1-t2 anyway. Besides of that it will not be playable, barely water-shaman will be a thing or freeze shaman will run this card.
Not sure you really need to run Quest for this to be good. Skipping turn 1 for Quest probably makes the kind of deck you run Murloc in a lot worse.
I guess now you just run Midrange Shaman with the Murloc package, you run one or two of these instead of Menagerie Warden and it thins out your deck in the late game, and you run Brrrloc instead of Hydrologist.
The question is what direction do you go in the late game? Probably Evolve and Deathseer I guess, not sure Moorabi and the freezing taunt is good enough. Maybe both? Super questionable given you probably want to run a ton of AoE/removal instead, but if the meta is slow then sure?
Another card which is strictly better than a warlock card (Sense Demons).
A cards effectiveness is entirely reliant on the class that it is. For example, Warrior would love to run Fireball, but it would be far to powerful due to Warriors early game agro power. Therefore they get Mortal Strike, which is actually still powerful in Warrior, despite being strictly worse than Fireball.
You will never be in a deckbuilding situation where you need to choose between Ice Fishing and Sense Demons therefore the comparison is useless.
Cheap card draw has always been something aggro wants so it can draw and develop board in the same turn and to not run out of steam as easily. This draws 2 synergistic cards for 2 mana, that's just insane in the right deck.