The Emperor Thaurissan challenge was particularly interesting with the need to keep one of his minions alive therefore denying the use crowd control cards and having to get used to a steady dribble of damage each turn.
In the end I managed to get a Lightspawn buffed to 10 for a mid-game victory but the gameplay challenge here was building a deck to achieve a goal for the first time, rather than trying to cover the bases in ranked play.