The Hearthstone website still has pre nerf Jaina and knife juggler on it. : r/hearthstone
The 12 Biggest Nerfs in "Hearthstone" History - LevelSkip
The Hearthlab Part 3: Put This Apple on Your Head! - Articles - Tempo Storm
Pre-nerf Knife Juggler, had it not existed before, could have been released as a legendary in ROS. - General Discussion - Hearthstone General - HearthPwn Forums - HearthPwn
Hearthstone Arena Strategies | In An Age
Breaking down the next batch of Hearthstone card nerfs