Hearthpwn

Seems too expensive to me.

For +4 Attack plus Rush, plus another 4/2 Rush minion? No, it's not too expensive. It will usually let you trade up with the target minion and then immediately clear another minion with the deathrattle. That's a pretty big swing for 4 mana.

"Sir, there's a...Tauren riding around on a Kodo...outside the city gates."

"Is he assaulting anyone?"

"No...he's just sniffing every plant and prancing around."

"No matter. You know the rules for his kind.  Shoot to kill."

What deck would play this card though? Token Druid? It seems rather underwhelming in a token deck when compared to Soul of the Forest and Pride's Fury. I guess I could see this card combo-ed with Lake Thresher or Moonfang, but that's very expensive.

that's a hard question when we have only seen 1 druid card. even some neutral minions could combo off this and spawn its own arch type with Druid. time will tell :D

this seems like what druid really needed, a way to take down something big. or two medium-size targets.  Question: if you play this on a Greybough, then swing in and it dies. does the Greybough buff hit the Kodo? I'm thinking no because deathrattles seem to go off in order of them being played. but can't wait to try it out. 
This means if you have 9 mana and one minion on the board with things to trade into. you could do some silly combos. 

This will see lots of play. 8 damage coming from a single card not even including the base attack of the minion that is enchanted. Good removal for a class that is lacking it.

Mounts are all going to see a lot of play, it seems. Druid definitely can use the Rush.

4/2 kodo with rush is the token i assume

Just saw the token, 4/2 with rush.