[Heroic Arch-Thief Rafaam]
Hi, this is a creative boss fight (boss uses your deck, you use one given to you). It is not too hard with a little luck. This is the deck I used for heroic and normal.
[Win Condition, The Rare Spear]
The main concept is using bad rares with bad stats and useless abilities. This is because the deck the deck your given contains a powerful weapon that gets +1/+1 every time he plays a rare card. before you know it your weapons hitting for TONS OF DAMAGE. Mull for this weapon.
The hardest part about this fight is his overpowered hero power, a free unstable portal every turn. Because of this there is a strong RNG factor to this fight. ie if hes getting free legends every turn your screwed. but thats not really that likely. This is where Finley comes in! he forces the boss to get a pleb hero power! which apprently he wont play. so its an extra dead draw which is to your advantage.
There is really alot of flexibility here you just have to be creative. Sort by your rares first and add the ones I suggested. then fill in with other bad rares or 1 hp minions. We give him no spells so summoning stone and mana addict do nothing. He has no main deck activators for eggs or ancient watcher. Coldlight oracle draws you cards and you dont care if he draws. 1 hp minions like angry chicken and wisp are easily cleared via mage power. The Naga is skipable I just tired it because it kinda turns off his hero power too. If you wanna get cute, you can try cards like ancient shade, doomsayer, and explosive sheep they can help you but could also backfire.
Good luck! may the eSportal be good to you!