10 likes: Mulligan + early guide
As always you will receive The Caverns Below in your starting hand. You have to focus on getting cards such as Shadowstep or Gadgetzan Ferryman (anything that returns your cards to your hand) and some low-cost minions, that you can play, then return. I recommend you Stonehusk Boar or Southsea Deckhand because of Charge.
Your early game is pretty simple. You need to choose one minion that you will play then return it to your hand. It is really easy to complete the quest but you have to pay attention to always keep your chosen minion safe from your opponent.
20 likes: Trade guide
Trades and mid game:
You only have to take the most necessary trades and just simply ignore enemy minions till you played Cristal Core Once it is done you can take up trades that are necessary or valuable for you.
30: Full guide (best combos to use, the fastest way to complete the quest, how to win the late game)
If you have any ideas about modifications I am glad to accept them!
Replacements, 10 and 20 upvotes guide added. Thanks for the support :)
Fire Fly replaced with Hungry Crab against murlcok decks. Si Agent replaced with Novice Engineer.