So definitely a great addition to the dragon paladin archetype, where it finds the perfect niche thanks to Aldor Peacekeeper and Humility that provide a fun twist on how to use this card correctly. Honestly, I was amazed to see how many times this card came in handy on turn 6 or 5 if coined out, to destroy an annoying minion such as a surviving Imp Gang Boss, Tunnel Trogg, Totem Golem or what have you... It actually is that good that you might surprise yourself and pick it from the card selection offered to you by Netherspite Historian (another strong addition to your dragon deck, fyi), so you get an extra removal for later in the game.
In +50 games with dragon paladin today alone, this "Book Wyrm" was never a dead card in hand. Slot well used.