Hearthpwn

The original idea of the deck came from Lea May. At first, I've seen this deck against Lord Shitlherspear.

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but there were some cards which I don't have like Deathwing or Big Game Hunter so I replaced them with Hogger and Dark Iron Skulker. After I defeated Shitlherspear I though it can work against Giantfin as well because of his hero power. At the start of his turn he draws two cards which has a perfect synergy with the combo of Brann Bronzebeard and Coldlight Oracle

The main challenge is to hold the board clear. You have many tools like Vanish, Sap, Fan of Knives and Blade Flurry. But there is a small problem: Giantfin has ca. 45 card, but you have only 30. That's why you have to make sure you have two Gang Ups in your deck. The greatest combo with this card to copy three times the Coldlight Oracle because with this tactic you reduce the number of turns to reach the Fatigue-phase of the game. In this phase I had 8 cards in my deck, and he got 4 Fatigue-tics. My hand was almost full and I used Dark Iron Skulker to clear his board. In this time he had 25 HP. I had on my board Brann Bronzebeard, Preparation, Coldlight Oracle (two or three) and Eviscerate. That was an easy win. Of course you have to try multiple times to defeat him because sometimes he has extremly lucky carddraw, but I tried 3 or 4 times to defeat his murloc with this deck (I think at the 4th time I managed to win).

This deck is not so expensive. It contains two legendaries (you have to have Brann because you get it if you finish the second wing of LoE), two Preparations, and some more rare cards.  If you don't have Hogger it's not a problem because it's replaceable (for example Abomination works really well).

If you want to defeat Shitlherspear you only have to replace Dark Iron Skulker with Saboteur. The tactic is the same.

I wish you the best of luck on the field of the Ruined City :)