Hearthpwn

Blade of C'Thun

Card with brackets

Excess Mana

Noncollectable Druid card.

Ghoul Infestor

A hungry dude

 Hungry Ettin

A minion with two heads

Ogre Ninja

A card with 50% chance to attack another enemy.

Charged Hammer

A card that interacts with your hero power

Clockwork Automaton

A card which could make some broken combo even more broken if was released before some key cards nerf (Yes, razakus priest, I mean you).

While maybe not broken, Feral Gibberer could have made for some annoying and fun decks alongside pre-nerfed Warsong Commander.

Contains "attacks a/your hero..." in the card text

Vicious Fledgling (aka flappy bird)

nobody refers to it by it's real name

Flamewreathed Faceless (Four Mana Seven Seven)

Dude with tentacles

N'Zoth, the Corruptor

9 mana powerful effect.

Edit: was typing this out for a while so had to redo.

Frost Lich Jaina

card that has to do with ice and stuff

 Frozen Clone

"Shit, I was testing for (other, usually better secret)!"

Misdirection

Demon on a card art but no demon tribe on a card itself

Crush

Warrior single target removal card

Light's Champion

Tribal tech card