I'm a total noob, always been in the back of the ladder, best I ever did was rank 2.
But let me tell you, this deck is crushing the ladder, CRUSHING IT.
Rules for mulligan:
discard all spell and 3+ cost minions: You want to be filling the board and have your opponent use spells.
Only exceptions: Ancient mysteries when you have secret keeper, Keep secret and kirin tor mage.
This deck has the perfect amount of draw / discover, I very rarely have no cards to play thanks to arcane breath, apexis smuggler. It also have the perfect amount of dragons, no need more, no need less.
Don't try to over combo, sometimes, just dealing 2 to a minion early is the right play.
Astromancer Solarian is a nice addition for late game "take back control", the azure explorere are great as they make you play with minions you wouldn't play in a tempo deck, ysera, alexstraza, deathwing. the 5/6 deathrattle summon a 3/4 is not bad, depends on the situation.
20 votes/comments and I'll write up a match-up guide.
19-3, just reached platinum, will update how far i go.
So for the moment i'm stuck in platinum, I've been trying many versions, change but none seems working better than the initial version
Still refining, no stroke of genius yet