Rastakhan's Rumble Guide
Neptulon (Battlecry related to murlocs)
Vilefin Inquisitor (replace hero power, rarity)
Charged Hammer (replace hero power, rarity)
'There is nothing more deceptive than an obvious fact'
Sideshow Spelleater (cost / restore health)
Reno Jackson (same attack, rarity and unique effect)
Mimiron's Head (Mana+Attack+Health dies to Shadow Word: Pain )
Gurubashi Berserker (similar effect as a class card)
Gahz'rilla (Same artist)
THIS ONE IS GUNNA NEED SOME RESEARCH
Chillmaw (referencing a popular cartoon in its flavor text)
Because you can't have enough research.
Captain Greenskin (Same attack, Same Health, Same artist)
Evil Heckler (cost, attack, health)
Forgive me, friend. I have failed.
Ancient Brewmaster (same amount of letters)
Your friends will abandon you...Your heart will explode...
Obsidian Destroyer (token summoning effect)
Violet Teacher (same attack and rarity, different cost)
Knife Juggler (green weapon depicted in the card art)
Poisoned Blade (rarity, interacts with hero power)
Coldarra Drake (Tribe, Rarity)
Explosive Shot => Meteor
Power Word: Tentacles => Spikeridged Steed
Twilight Guardian (another guardian)
Fjola Lightbane (more spell synergy)
Eydis Darkbane. I had to :P (another card that deals 3 damage)