Hearthpwn

I think with the increase to durability and decrease in cost this card is more viable. Unfortunately the prevalence of ooze due to strong weapons in other classes will likely prevent Rogue getting good value out of this card. 

It's easy to get to 4 attack with Deadly Poison and with the addition of Toxicologist to the core set there will be another reliable weapon buff in the card pool. 

I think the  question is whether Rogue is about to become aggro/tempo only, and that means this weapon only serves to hit face. This weapon could be an Arcanite Reaper on steroids.

I doubt they'll be adding large amounts of healing to Rogue to mitigate using this to clear minions...

An... interesting change, but probably not enough to make it good. See Self-Sharpening Sword for reference.