Exodia Paladin

First off, this deck was inspired by a version of Exodia Paladin created by thedragofire. You can view their version of the deck here:

I would have never thought about Licensed Adventurer for getting copies of The Coin necessary for the combo as well as how well 2 discounted Libram of Wisdom contribute to the combo and draw packages.

The Combo: After playing Uther of the Ebon Blade some turn prior, you play Auctionmaster Beardo and then alternate between hero power and one of the required spells until you have all 4 horsemen. Be sure you hero power first before playing a spell and have the required combination of spells, which can be:

-2 copies of Libram of Wisdom (discounted to 0) and 1 copy of The Coin 

-2 copies of The Coin and 1 copy of Libram of Wisdom (discounted to at most 1)

-2 copies of The Coin and 1 copy of Crystology

The Mulligan: General good keeps include: Crystology, Wild Pyromancer, and Flash of Light.

Situational keeps include: Subdue, Shrink Ray, Amber Watcher, and your quest which depend on the class matchup whether you think it is beneficial to keep or not.

-Subdue and Shrink Ray are situational keeps that 1 copy should be kept of if you think your opponent can quickly build a threatening single threat or wide board respectively.

-If you think your opponent is a burst deck, 1 copy of Amber Watcher could be kept to help you stabilize.

-The quest should rarely be mulliganed away as doing so risks having quite a few dead cards in hand with Questing Explorer and Licensed Adventurer. It might seem tempting to mulligan away the quest if you think your opponent is aggressive, but having The Coin is pretty useful for an early board clear with Wild Pyromancer.

Keeping 1-attack minions can hurt your draw efficiency by making Crystology more likely to whiff.

Final Notes: Wild Pyromancer is meant to be used with Acolyte of Pain for maximum card draw. Do not use Wild Pyromancer with Shrink Ray unless the situation calls for it, like if the opponent's deck utilizes wide board buffs or there are threatening on-board effects; however, most of the time Shrink Ray will be enough to answer a big board. Also, while The Last Kaleidosaur is better than Making Mummies at creating an alternate win condition if you are being pressured fast enough, the situation doesn't happen often enough. If you already have Making Mummies, you don't need to craft The Last Kaleidosaur.