Hearthpwn

First of all, i created the deck cause of this deck [BUDGET BEAT LICH KING #4] Hunter , so credits to its creator :)

Mulligan:
In my oppinion there are a few winning conditions. Like mostly every hunter too, try to mulligan for your cheap minions like Alleycat, Fiery Bat, Crackling Razormaw,King's Elekk and Scavenging Hyena.
You can also keep Molten Giant. He will destroy it on turn 2, but so he loses tempo and you get 8dmg anyway.

Deck Idea:
Try to kill your opponent with efficient trades and synergies, like buff Scavenging Hyena with your killed beasts and evolve it with Crackling Razormaw. Windfury is good, but remember, the Lich King can always destroy it(Obliterate), so sometimes its better to evolve for health and/or spellimmunity.
Other than that you have a huge draw engine. King's Elekk can give you free giants, as well as Tracking and Call Pet, which will also allow you to cycle faster through your deck and play most of your draws for free(means free giants, and mostly free minions).

About the Lich King:
- You need to kill him till turn 7, mostly till turn 6. Turn 7 immun to everything, turn 6 he plays Blizzard most of the matches.
- He will always trade into your strongest minion(sometimes he removes your windfury-minion)
- He also always destroys your strongest minion with Obliterate pretty easy, keep that in mind.
- Last but not least, never play just 1 minion at your first turn. He will freeze it and kill it with his 2/1.

hope you enjoy this deck as much as i am, if it helped, please give me a thumb up !
cheers :)

Also, here is my deckcollection for Arthas/The Frozen Throne, tested them all:
https://www.hearthpwn.com/decks/1041027-the-frozen-throne-beat-arthas-3-decks-each-class