This is the Unite the Murlocs HS Shaman Quest Card from the Journey to Un’Goro expansion due for release in April.
The card reads: Quest: Summon 10 Murlocs. Reward: Megafin.
Megafin
This is the Megafin HS Shaman Card from the Journey to Un’Goro expansion due for release in April.
It’s a Shaman class minion and the card reads: Battlecry: Fill your hand with random Murlocs.
You can get Unite the Murlocs by opening packs from the Journey to Un’Goro set.
If you want to know more about how the Quest keyword works check out this post.