If you’re wondering how to get HS card Medivh’s Valet – you have to complete the first boss called Shade of Aran in the fourth wing of the One Night in Karazhan adventure called The Spire.
The bosses in the Karazhan adventure have been super-easy, and the Shade of Aran is no different. His hero power gives both players + 2 spell damage, so you can use a deck with spells to take advantage of this.
I just queued up my Zoolock and breezed right through him.
Hearthstone Card Medivh’s Valet
This card reads: Battlecry: If you control a Secret, deal 3 damage.
This is a really good card that has a lot of value in decks with secrets. Mage’s don’t run as many secrets since Mad Scientist cycled out of rotation, but this card can change things.