Hearthpwn

Could easily be a (2) drop and still it wouldn't see much constructed play. Only in specific decks such as freeze mage (Where it would actually be quite useful, meanwhile not actually broken).

Just look at Novice Engineer (never played):

(2) drop; 1 Mana stats - 1 health = Draw

Or Loot Hoarder:

(2) drop; 1 Mana stats - Deathrattle = Draw

Now we have Gnomish Experimenter:
(3) drop; 2 Mana stats - Polymorph any minions drawn = Draw

I'd argue that the Polymorph effect is as bad or worse than the deathrattle, and its cost makes no sense.

This card is insanely underpowered compared to the severe Power Creep that took place in GvG and it saddens me that such a good concept went to waste.
It would also be an incentive against aggro, which is exactly what Hearthstone needs.

"Truth is my s**t!"