Hearthpwn

Card Choice Explanations:

The Caverns Below Ummm... Yeah.

Wisp - The biggest question mark. This card while normally terrible has tremendous potential as a bounce candidate that looses zero tempo. It can be a great tempo play as well the turn you cast the quest spell to make up for the tempo loss of the 5 mana. 

Preparation - Important for tempo-ing out the important spells

Shadowstep - Ummm... yeah..

Fire Fly - This is simply a 1 mana 5/5 - add a 1 mana 5/5 to your hand.

Glacial Shard - This is great stall card vs. aggro and late game becomes a 1 mana Frost Elemental

Swashburglar - A good candidate for bouncing, creates card advantage, cheap 5/5 late.

Novice Engineer - Cheap card draw and cycle.

Sunfury Protector - Help for stabilizing after the quest is complete. 2 mana 5/5 - create 2 taunts. Also decent for stalling.

Gadgetzan Ferryman - Bouncing is key - better and cheaper than the Ancient Brewmaster.

Youthful Brewmaster - See above.

Coldlight Oracle - the most efficient card draw, this deck should make far better use of its cards than the opponents in theory.

Mimic Pod - A means of more quickly finishing the quest and efficient card draw.

Vanish - This is the main recovery mechanic. After the quest is complete (or in a pinch before) this card can be used to very quickly flip a board. Amazing synergy with the cheap minions board control. Note it also leaves Sherazin's Seed on the board.

Questionable Slots:

Thistle Tea - A great way to multiply cards late game, its mana cost is made up by the tempo of the boosted 1 drops.

Moroes - Finisher, pops out a free 5/5 each turn after the quest.

Sherazin, Corpse Flower - There will be a lot of turns where 4 cards can be played, comes back as a 5/5 each time after the quest completes. Could get a ton of value.