If you’re wondering how to get HS card Violet Illusionist – You have to complete all three bosses in the fourth wing of the adventure One Night in Karazhan – The Spire.
The bosses are not hard on the normal mode, and after beating them all you unlock all the cards for the wing except the Class Challenges. I cover each of the bosses in separate posts and which cards you unlock from each boss, just follow the links below:
Hearthstone Card Violet Illusionist
The card reads: During your turn, your hero is Immune.
A neutral card, the obvious synergy is with the Warlock hero power and weapon classes.