What is "Sidequest Druid"?

There are currently a lot of good quest synergy cards; there are even Rogue decks that play the quest and never complete it, just to get access to the quest synergy cards. Since sidequests count as quests for these cards, I wondered if you could play a deck with four sidequests and no main quest. After playing this deck for a while, I think the answer is "yes".

Game Plan

This is an aggressive mid-range deck. It can summon big minions early via Strength in Numbers, Breath of Dreams, Frizz Kindleroost and Escaped Manasaber. While your opponent is dealing with those, you hit face as often as you can afford and finish them off with Claw, Swipe and/or Leeroy Jenkins.

Playing Embiggen before Strength in Numbers completes is advised. But unless you have a good curve in your hand already, maybe you shouldn't play Embiggen on turn 1. Compared to the typical Embiggen Druid, this deck leans more on the sidequests than on Embiggen: it has more burst via Secure the Deck and on average bigger minions to pull from the deck. Embiggen is a way to keep adding pressure, but not the central card of the deck.

Mulligan

Keep the sidequests, Breath of Dreams, Questing Explorer and Licensed Adventurer. Embiggen is a keep if you're on the coin or have card draw in hand already; keeping it in a 3-card opening hand is likely to lead to dead turns, so I wouldn't recommend that. Frizz Kindleroost, Escaped Manasaber and Swipe might be keeps depending on what you expect from your opponent and what other cards you're keeping. If you're still hunting for an activator for your 2-drop, you're probably better off not keeping them.

Mechanical Details

If you complete Strength in Numbers with Questing Explorer or Licensed Adventurer, the battlecry fizzles. So if you can, try to play these minions earlier or after you set up another sidequest.

Substitutions

I think that none of the legendaries are essential. If you take out the legendary dragons, Evasive Drakonid is a replacement that keeps up the dragon count for Breath of Dreams while being decent when pulled from the deck by Strength in Numbers.

In general, you should take care that any minions you include are decent when pulled from the deck, so try to avoid battlecries. Breath of Dreams or Licensed Adventurer can bring you to 4 mana sooner, so Evasive Feywing is an option if you want to lower the curve.

The deck might even work without Embiggen, since it's still decent if you don't draw that.

You do need two copies of Secure the Deck, to make sure you have a high enough chance of activating the quest synergy cards.