Lakkari Sacrifice has turned out to be one of the hardest Quests to accomplish, even with the amount of old and new discard cards in the game. You will mostly find control versions of the Quest Warlock including cards like Jaraxxus and Twisting Nether. However, the decklist provided by Greensheep, one of UK's favorite players, follows a mostly aggressive path.
Two of the best cards in this deck are Clutchmother Zavas and Lakkari Felhound. Clutchmother already gains value after just one discard by becoming a 4/4 for two mana -- but if your board position allows you to wait and buff her a bit more, then the new legendary could grow out of proportions rather quickly.
Lakkari Felhound, although an odd choice for an aggro deck, actually works really well by protecting all those smaller minions on the board and allowing them to keep pushing the much-needed damage to your opponent’s face.