Hearthpwn

The point of the deck is very simple, get the board control with some early value minions (Wyrm, scientist, flamewaker), destroy enemy minions with spells (turn 3 apprentice into flamecannon/frostbolt is perfect), finish the opponent with the minions on board or steal the game with a Fireball to the face

Paladin is a good matchup for tempo-mage and that's why it's such a great deck in this meta. If you get board control you'll win, care about Shielded Minibot with Redemption and try to play around Consecration

Mulligan : Go for an agressive mulligan for Mana Wyrm, Mad Scientist, Arcane Missiles, and Flamewaker if you have the coin. Sorcerer's Apprentice is fine if you have low cost spell but is not quite as good.

Druid is the best matchup for tempo mage, ALWAYS clear their minions if you already have board control, try to play around Swipe. The most important thing is that since TGT, Mirror Entity can be a bad thing with theirDarnassus Aspirant. Always care about this card because it's almost and instalose if their manage to kill your darnassus before turn 4.

Always mulligan for Flamecannon, Frostbolt (to kill the darnassus) and Mana Wyrm,Mad Scientist and for the apprentice.

You can win this matchup even with a bad hand tho

As midrange hunter is an even matchup, Face is harder and i suggest if you face a lot of those, put a Sludge Belcher in your deck asap (instead of Azure Drake, or unstable). SMorc Hunter is a pain in the ass. Just try to get early board control and finish him before he double Kill Command your face

Midrange hunter is all about board control, if you can get a good value out of Flamewaker you should win easily.

Mulligan for Mana Wyrm, Mad Scientist, Sorcerer's Apprentice, Flamewaker, Flamecannon andFrostbolt. Mirror Image and Arcane Missiles are ok if you're scared you'll get nothing or if you already have synergy creatures 

Since it's almost only tempo mages right now, just go for an aggressive mulligan, try to get wyrm or the scientist and if you have a better start than he does,play aggresive, otherwise try to get the more value you can from your minions. Keep 1-2 creatures and Flamecannon and Frostbolt and it should be ok

If it's a mech mage it's the same thing, If it's a freeze mage, care about the mirror entity on the Doomsayer and rush face as much as you can.

Priest are a hard matchup but not unwinnable at all.

Vs Dragon Priest it's all about early board control so go for an aggresive mulligan for you early creatures and flamecannon for their Wyrmrest Agent. A good Holy Nova can make you lose, and a good Flamestrike can make you win.

Vs Control priest, just rush face, keeping board control, and care because they can steal your Flamewaker with their Cabal. The combo Rhonin + Archmage Antonidas, or Rhonin +Flamewaker will destroy them if the game is not over by that time. Mulligan for early minions

If it's a Handlock, just rush them face, you can win very early (turn 4/5) with a great hand, your mirror entity is your best friend. Sometimes the Handlock will get a perfect hand and he'll detroy you, don't worry, this happens. Mulligan for 1-3 minions

If it's a Zoolock, it's The Hardest matchup for us. Just prey for them to dont have a great hand and try to get board control, mulligan for 1-2 minions and Flamecannon or Arcane Missiles.

are beaten down quite easily in this meta, just mulligan for wyrm, scientist, flamewaker, flamecannon and frostbolt and win this. Care about their clean (Blade Flurry and Lightning Storm

Now that patron Warrior is gone, warrior is a very good matchup for us. Their is two kind of situation when you're facing a warrior.

Or you get a really good curve and detroy him early, or you are stuck in a value game where you CAN win. Thanks to Rhonin making awesome combos happen, with antonidas or even flamewaker (sometimes you'll detroy the warrior by playing flamewaker + 5x arcane missiles)

Mulligan for Mirror Image and turn 1-3 minions

Because he's made me win a lot of games with very funny combos, he allows you to destroy control decks where they should crush you. Some are saying that he's too slow because he dosent impact the game right now, it's wrong since it's a 7/7 and the enemy is forced to deal with him right away. I'll tell you, the game where i got legend, i played vs a conntrol priest and i had only rhonin on the board, i had a flamewaker, two arcane missiles and a fireball in my hand and he played sylvanas. I fireballed my own rhonin and traded for sylvanas and dealt more than 20 damages next turn.