Hearthpwn

..the one that uses Hemet/dollmaster/plot twist/mechathun/cataclysm?

Quest Mage, Pirate Warrior and aggro decks in general.

Or highlander decks with dirty rat and counter spell etc.

There are certain cards that can kill those archetypes combos like Dirty Rat, Mischief Maker (meme), and Mojomaster Zihi.

But warlock also has more anti combo tools that you could use like Gnomeferatu, Demonic Project, Howlfiend + Treachery and Chaos Gazer.

Decks counter would be decks mill and warrior bombs.

There are more anti combo cards but they are quite slow or they are not very effective.

Weasel priest.

Bomb Warrior probably the best, other than that anything aggro.