Its always thrilling to see the community respond with questions and acknowledgment, here are the mulligans:
Doomsayer , Totem Golem , Tunnel Trogg
These are always a must keep. Obviously it's wierd to see a Doomsayer in a deck with Trog and TGolem but I found those two cards we're not enough to counter explosive tempo mage/shammy/zoo openers. If you get a Doomsayer in your mulligan, along with a Trogg or TGolem, you simply play Doomsayer on curve (or coin him if you think he can remove it) and than play your 1's and 2's on turn 3. The main reasoning for Doomsayer is that the current meta seems to be about who gets the early tempo, and Doomsayer has been delivering exactley that so far. You'd be suprised how often you use him turn 4 or 5 and it wins you back the tempo, because you might be overloaded and the alternative would be to just totem up yet since you still have a Doomsayer, now your stall mechanics are much safer.
Fireguard Destroyer - This card deserved the spot because of pure synergy. Its perfectly fine to play it on turn 4 and follow it up with a Windspeaker on turn 5.
That usually allows it to trade into Azure Drake and get another attack down.
Its also out of Swipe + Moonfire range.
Windspeaker - The reason this is in instead of Windfury is because the body(3/3) is very much appreciated in a aggresive meta as it currently is. It trades well with Feral Spirits , Void Walker , Manatide Totem , Flametongue Totem , etc,.
I felt the list needed more card draw, but since it has soo many threats/huge bodies, It rarely ever needed it. Keep in mind, you have good ways to protect your mana tides with cards like Unbound Elemental and Earth Elemental.
I'll update it a few days, good luck on ladder!