I missed the Jade idol counter, but this also hard counters quest mage.
Most quest mages Mulligan their quest for more early game consistency, so with this card as prevalent as I expect it to be (because of the Jade counter) mages will be forced to play their quest turn one, losing that early game consistency in favor of a guaranteed quest proc.
Yes, this shits over jade druid but who want to run a 6 mana 4/6 against anything other than jade druid? Maybe a control warrior tech card but it's pretty bad.
edit: well looking through the card manager it does look like this card can screw up some niche archetypes besides the more popular jade druid. For example, it craps all over silence/miracle priest, buff/quest paladin. This card may have a place depending on the popularity of certain decks.