Search in the Dephts of Book

Endless catalogue 4 (As this enters the library
zone, put the top 4 cards of a library you own
without endless catalogue face up on top of this
card as a new library. As this becomes empty,
put the top 4 cards of a library you own without
endless catalogue face up on top of this library. If
you can't, put it into its owner's graveyard)
Each time you cast an instant or a sorcery spell,
you may draw a card from a face up library you
control.