EHere's my current version of the quest warlock deck.
A full write-up will follow after some more games. But in short with the additions of Sphere of Sapience and Lorekeeper Polkelt the questlock deck offers more options to directly draw either Malygos or Alexstrasza for 0 mana as the main finisher. With the sphere you can redirect the cards you would like to draw with your hero power.
The deck also runs a soul fragment package to stay alive / activate soulcologist. Be aware that after playing polkelt, any new fragments added to your deck will re-shuffle it again. Polkelt is best saved when you have your finishing spells in hand, hero power activated and malygos still somewhere in your deck.
https://imgur.com/a/CJ7GWUU - winrate so far. Will continue to update as I play. So far 20 games, 17 wins, 3 losses. Not the minimal 30 yet, but getting there. Currently playing this deck at rank 1 diamond. Managed to climb from Diamond 5 to Diamond 1 now. Most difficult matchup now is bomb warrior.
Replay vs tempo demon hunter - close win: https://hsreplay.net/replay/eGrTPmoiiVNFJD5Vbzv6HH
Replay vs Libram Paladin - close win: https://hsreplay.net/replay/dH2tTPDSGYHSVngZ2Q4ySf