This is the Hoej Yogg and Y’Shaarj, Rage Unbound Ramp Druid Deck he 
was playing on stream, and a lot of other Pro’s have been quick to pick it up and play around with it.
Ramp Druid has always been an archetype that’s worked in different META’s, generally the slower META’s. It’s not a particularly slow META right now but the addition of newer cards like Feral Rage and Raven Idol, along with Fandral Staghelm has made it quicker to ramp up and easier to add additional health.
The goal here is to get Y’Shaarj, Rage Unbound on the board and let him start pulling big minions out of your deck for you. The sheer value cannot be matched by your opponent, and without specific cards they just will not be able to deal with the pressure.
Mulligan Strategy for Ramp Druid
As the name of the deck suggests, you need to go all in for those ramp cards. Wild Growth, Innervate, and Mire Keepers will get you ahead of the curve and ramp you up to drop those fatties.