Hearthpwn

between 2 expansion I would like to see a balance patch. I believe 2 month is enough to gather data and balance patch will give us the feel of a mini expansion due to the meta shifting.

Mysterious challenger with put noble sacrify and redemtion so Protector pottentially can give 2 divine shield on curve . Also 7 mana mean it fix the gap between Dr.6 and Tirion. I think this card pottentially can help secret paladin a bit.

Strongest card ever. It move Beast Druid from Dumster rank to tier 2. You need to setup for the Warden turn though, which require that you have the board. At worst he is a faceless summoner but in the right situation he is a 6 mana 10/10 or 9 mana 17/19 with brann 

Don't craft Ragnaros if you don't have any deck to put it in. Because it is not a win condition. N'zoth is king of value, but you need to build a deck around it. Yogg is the most versatile since you can throw him into any spell heavy deck (which is cheap). The different is Yogg is NOT a guarantee  win condition and N'zoth is way too slow against current meta deck. I recommend you to either craft Yogg or choose another Legendary that is staple in the deck you want to build  

No DoomCaller maybe good but C'thun deck with no brann really ? extra 10 armor or 1 more 4/6 is definitely a  top tier effect for a 3 drop.

she is the best neutral 6 drop. If you dont have any good 6 drop or just need a subs for any card just put in a sylvana. She is slow though which mean that she doesnt fit in aggro and tempo deck and unfortunately those deck  are mostly the main/strongest  deck of any f2p player.  

Leeroy is the way. Rogue need to finish game asap. Azure Drake is already give you draw + spellpower. You will want to topdeck a charger more time than a cheap spellpower.

You never want top deck him in late game because he is a 1 mana 1/1 do nothing. You never want to keep him in opening hand because your hand will be -1 (like Forbidden Shaping). You never want to draw him when you are ahead because you need finishing stuff like charge or burst. The only time he is good is you draw him when you already have enough stuff to do for 1-2 turn and you pray him to turn into big Stuff to bait enemy removal (like Forbidden Shaping) or turn into useful stuff like Udaman.   

You mean dusting them ? Yes. You can use Violet Teacher (100 dust) to replace Illidan Stormrage and craft Silver Hand Knight (40 dust) to replace Hogger. They work nearly the same for cheaper mana and you save 640 dust for your deck. Only keep legendary that is strong or have unique effect. 

If you want a to build a good deck, you should have the core of the deck which some of them is on adventure. So unless you want to stick to your rank 15 or play some weird deck you need adventure.

I suggest you to buy 1st wing of BrM , in that wing they have Emperor Thaurissan , which enable a lot of combo deck. 700 gold for emperor alone is totally worth it. Brm 2nd wing have ImpGangBoss which is the best minion in warlock overall and the staple in any warlock deck (include Zoo - cheap and tier 1 deck - about 2000-3000 dust)  . LOE 1st wing only have Reno Jackson, but the 2nd wing have Brann Bronzebeard and the 1 drop for Shaman (tier 1 atm- and whole deck cost like 2000 dust) , which is what a f2p player should aim for. 

Turn 1: Smuggler's Run + The Coin + Argent Squire = Shielded Minibot

Nerubian Prophet is too good to not have in this deck.  If it's in your hand at start.  You play it turn 3, evolve it with Master of Evolution for a 7 drop on turn 4.  One game I evolved it turn 4 and 5 and got a turn 5 Tyrion Fordring.

Auto include for any deck with evolve