Cartomancers can use monster cards (i.e. scrolls of create monster) by throwing them as well as reading them. If thrown, the monster is created on or adjacent to the space where the scroll hits the ground.

Cartomancers don’t spellcast using Pw. Instead, they read the book (which is instantaneous for them, and possibly subject to a failure chance like normal if the spell is not known) and the spell immediately takes effect. This increments the read counter for the book, so each book can be used to cast a spell 4 times before it blanks.

Add several new never-randomly-generated cards, all of which are designed to give strong but short buffs, to you and more often allies. Though their frequencies are 0, they are sometimes dropped from monsters you and your pets kill, at the same frequency the keyed create monster cards do.

Other roles can write these scrolls if they want to or find them in bones, but they are generally intended to be less powerful than many existing scrolls so they shouldn’t steal generation probability from them.

Kills by cartomancers’ pets should also have the occasional chance to drop a card of summon monster. It should not just be limited to player kills, since this disincentivizes the whole strategy of using temporary summoned monsters to do most of the fighting.

A chaotic Cartomancer who performs a same-race sacrifice gets not a peaceful Juiblex or Yeenoghu, but a card of summon Juiblex or Yeenoghu.

Cartomancers start with the create monster card identified and they have a whole bunch of them containing various early to mid game monsters in starting inventory.