This is my favorite deck as of late. I was inspired by the Quest Druid I saw running around but found myself unable to answer big swings, so I combined it with some Highlander cards to make up for this problem. It's worked so far to great results and it's been really fun. You get the best of both worlds: insane "Choose One" cards with great value and flexibility in the Highlander package. I also found that Druid has an amazing Discover pool that's made better by completing Untapped Potential. You can discover and create tons of win conditions to rule and swing the board for a win.

The late-game of this deck is crazier than anything I've seen: you just copy your best Highlander cards with Elise the Enlightened. This allows you to play up to 4 Zephrys the Great or [Hearthstone Card (Dragonqueen Alexstraza) Not Found] in a single game because of Flobbidinous Floop. No deck can keep up with this that late in my experience. It's a fun deck that does very powerful things as soon as you get your mana ramped up. 

Here is one of the many crazy boards I've created with this deck: