If you’re wondering how to get HS card Book Wyrm – you have to complete the second boss called Netherspite in the fourth wing of the One Night in Karazhan adventure called The Spire.
This is a fun boss battle. There are two portals on the board, a blue and a pink. Any minions you place on the right-hand side next to the blue portal will only take one damage per turn. While minions placed on the left next to the pink portal will have windfury.
So jam your big minions on the left to do double the damage, and put your buff minions on the right. You can complete this Boss with just about any budget deck I’m sure.
Hearthstone Card Book Wyrm
The card reads: Battlecry: If you’re holding a Dragon, destroy an enemy minion with 3 Attack of less.
Costly at 6 mana but the potential tempo swing justifies the cost I think. Going to need to test this card a bit, most likely in Priest as an extra anti-aggro tool.