Nothing I can see about summoning them. I think also, and I may be wrong here, GW are aiming for people to use the models they have as the actual model. So a "Bloodthirster of Insensate Rage" model can only be used as such, and not as a "Bloodthirster of Unfettered Fury". So the daemon player would need to have not just one on the table, but also spares of the same type of model in reserve. Rage confers "Summon Rage" spell, and "Fury for Fury" etc. etc. I imagine people will allow proxying to a point, but the guy who rocks up with 5 bloodthirsters, loads of blue scribes etc, would just never get a game.The Blue Scribes are a single model. One of the Scribes, P’tarix, transcribes pages of magical sigils, halting only to stab at approaching enemies with his Sharpened Quills, while Xirat’p reads his twin’s scrawl, casting spells hither and yon. They ride a Disc of Tzeentch which attacks with its Many-fanged Mouths.
Fly
The Blue Scribes can fly.
Abilities
Frantic Scribbling: Roll a dice each time a Wizard within 18" of the Blue Scribes successfully casts a spell (whether or not it is unbound); on a 4 or more the Blue Scribes learn that spell and can attempt to
cast it in subsequent turns.
Scrolls of Sorcery: Once in each of your hero phases, the Blue Scribes can attempt to read from their Scrolls of Sorcery instead of making a casting attempt. If they do, roll a dice; on a 1, they can’t decipher the scrawls and the casting attempt automatically fails, but on a 2 or more, that spell is successfully cast and can only be unbound on a roll of a 9 or more.
MAGIC
The Blue Scribes can attempt to cast one spell in each of your own hero phases, and attempt to unbind one spell in each enemy hero phase. They know the Arcane Bolt, Mystic Shield and Boon of Tzeentch spells.
BOON OF TZEENTCH
The Blue Scribes reach forth, tapping into an unseen hoard of arcane power. Boon of Tzeentch has a casting value of 4. If successfully cast, you can re-roll failed casting rolls made for Tzeentch Wizards within 18" of the Blue Scribes for the rest of the hero phase
But I'd still say first turn is more important than ever, especially when it comes to nuking a daemon wizard or two And I'll be trying to find some more hound models to summon too, as well as getting as many branchwraith spells to summon dryads off as possible!
Maybe I'm just a frenzied optimist