4. Lorewalker Cho
While it seems like Cho is good, the only thing he is really good at is starring in crazy combo videos that let people deal thousands of damage in a turn. For a 2 cost minion, Cho is pretty horrible. He has no attack stat, so he is only useful for his ability. However, this often slows both players down, and your opponent can easily kill Cho in two turns, as the average 2 cost minion has an attack of 2 or 3.