Hearthpwn

its good against fiery bat

option a greatly appeals to tempo mage players, we gotta love rng

1) you can get spells like fireball/frostbolt that you have two copies of them anyway.

2) the 1/1 body can be very good in the start of the game: for example, your opponent plays a 3/2 minion and now you can hero power/ attack and save your frostbolt, or just kill Fiery Bat for "free".

Because having extra cards is usually always really good. 

Quote from jbagels1 >>

Because having extra cards is usually always really good. 

You get an option.  I agree that you will get bad cards many times, but the chance to get a perfect spell matching your situaiton is too powerful.

Also, as the effect is a Battlecry, it's spell + Battlecry synergy.

Firstly, mages have almost zero "trash spells", which is exactly why they dominated the arena for so long. Even normally "trash spells", like Freezing Potion, suddenly have potential use since any deck is gonna run Water Elemental, Frost Nova and Blizzard.

Plenty of mage cards have synergy with any spell, so just having an extra one improves your mana wyrm, Midhive, Antonidas, flamecaller [wild], etc. And that's IF you manage to draw one of the rarely, truly situationally-dead mage spells. The odds of you drawing reach or tech of this card are much higher, and, it's a 1 drop. 

so in addition to having at least something on the board to pair with your fireblast via your opponent's two-drop, you're likely to drawa free something-useful and at worst potentially drawing something supplemental to another card in your deck, 

Additionally, as a 1-drop card, even if you don;t pull it on your intitial draw, it is easily one of, if not the best, burn for unused mana on any turn where you can;t play on curve. Being one mana, it also slides into your usual, more productive Brann turns.

The minimum value for this card is a 1/1 for 1 with at worst an ok-to contextually useful additional spell, but the general case is a 1/1 for a useful-to-amazing spell (simply because Mage cards are notoriously independent of being combo-dependent). 

tldr: babbling book is the shit.

Quote from twitchy >>

Quote from jbagels1 >>

Because having extra cards is usually always really good. 

 That doesn't make sense... You're technically not getting 'more cards', just a 1 mana 1/1. And "usually always really good"...?

Quote from yehudi3000 >>

2) the 1/1 body can be very good in the start of the game: for example, your opponent plays a 3/2 minion and now you can hero power/ attack and save your frostbolt, or just kill Fiery Bat for "free".

I can agree with that tho, especially in the current aggressive meta. 

Confirmed better than Malygos and Emperor Thaurissan.

nerf it, now! :D

https://youtu.be/AUHeMVWi2yg?t=8m30s

I just want to cast a spell!

Just dropped this for the win. This card has serious troll face for maximum insult to injury.

If anything, Spellslinger is an example of a terrible card, design-wise. It's a vanilla 3/3/4 that has a very unpredictable RNG outcome, that could decide the course of the game because you're making it impossible for any player to play around a certain random spell.

Babbling Book, on the other hand, only gives Mage spells, making it hard, but not impossible to predict your opponent's hand. It also increases variance in the Mage player's games, creating different scenarios they likely never met with before. It's body is well understated for the mana cost, but, in return, it doesn't sacrifice card advantage. This is undoubtedly a gem of Karazhan.

3/4 for 3 is significantly better than a 1/1 for 1.

Very nice addition to the mage decks. :)

Easy synergy with Brann. Though I only manage to play them together once, it gave me 2 copies of the same spell.

Don't know if it's intended or incredibly bad RNG.

This thing reminds me of the hotdog from Perfect Hair Forever: https://www.youtube.com/watch?v=-5MuVnVAlro

He sounds like H. Jon Benjamin

Cringing book

He sounds a bit crazy...

He looks happy... But sounds really mad.