Research, Research, Research

{x} x {u}{w} X = Book Tokens. Discard 2 Book Tokens to Enchant 1 Sorcery on 1 or more Legendary Creatures or Planeswalker.

That Creature or Planeswalker may use that Sorcery as an ability, cost 1 mana. If Planeswalker, ability is a +1 Loyalty.
The librarian refused to let Xelzaz put his "claws"
on the spell book, so he read over her shoulder. Only two pages into the reading, she relented. Hours later, Xelzaz had learned much.