As per usual, Slitherspear gets 15 armor on top of his normal 30 health. There's no Finley to save despite his hero power being and he will never switch over to his enrage. Each progressive Hungry Naga summoned gains +1/+1 so on Turn 5 summons a buffed 5/5 minion.
Note: Giantfin has 50 cards in his deck, made up primarily of the above Murlocs. It's more important that you know which ones he can throw at you, not how many.