I also heard someone say this: "If a particular type of Deck sucks, and then 1 card comes along and makes it good, then that usually means that card has to go or at least be limited."
And that pretty much is true. For the most part everyone believes...
T.G. Hyper Librarian - Banned or @1
Dandylion - Banned
Lonefire - @1
Tengu - @? (however Tengu is TCG and possibly will be safe cause of that)
And uhmm a few others that slip my mind right now but they seem to be hitting Plants this time.