Zombie Chow. It's a powerful 2/3 for 1. It's deathrattle is decent but honestly if it does T2 tradeing for a 3/2 it's negiligable.
It's not negligible at all. The Zombie Chow can give you the tempo swing against the coin if they play a 3/2 (else they'll take some damage and you still get the tempo).
Consider the normal play:
You go first. No coin, just a 2,3,4 curve.
The opponent coins out a 2 and then you play a two. Opponent has tempo probably for the next few turns.
If you play Zombie Chow. They coin out a 3/2 like Knife Juggler. You trade for it, heal them for nothing, and then get to play your own 2 drop. It's a really good card (for mid-range and aggro at least). The only downside to it is that it would be the most soul-crushing thing to topdeck.