The Rainicornicopia is a book that tells the complete history of Rainicorns. It was seen in the episode "Paper Pete," where Jake wanted to read the whole book so he can learn about Rainicorns for his future children.
The cover of the book is red and blue. Part of the book is chipped or torn, possibly because of the Moldos. On the title, the word "Rainicorns" is colored with many different colors. Also, the words "unabridged" and "history" are colored orange.
- Jake said that he has been reading just only a chapter in this book for eleven minutes, this was shown in the same episode.