Hearthpwn

The deck's so greedy, I didn't expect it to win at all, but Wild is such a greedy meta that it has won more than half of its games. It's fun to play, with a lot of randomness.

This deck generally wins by reducing your Arcane Giants' cost to 0 and then duplicating them using Duplicate, Effigy, Conjurer's Calling, and Echo of Medivh.

As a fallback, Archmage Antonidas can be quite powerful with a bunch of discounted spells stockpiled from Raid the Sky Temple. 

Yogg-Saron, Hope's End can get absolutely ridiculous with this deck because many of your spells give you other spells and Raid the Sky Temple gives a bunch of other spells too.

Mulligan away the Open the Waygate. It's unnecessary in the early game and is easy to complete once you have the other quest online.