Animate Library
Enchantment — Aura
Enchant your library
Enchanted library is an artifact creature on the battlefield with power and toughness each equal to the number of cards in it. It's still a library.
If enchanted library would leave the battlefield, exile this Aura instead.
Sometimes the books hit back.
Raymond Swanland
Rulings
While your library is a creature, it can become enchanted or equipped, it can be tapped and untapped, and it can attack and block like other creatures.
(wotc • 2018-01-19)
If Animate Library leaves the battlefield, your library goes back to being a normal library.
(wotc • 2018-01-19)
If your animated library becomes four libraries because of Split Screen, Animate Library stays attached to one of them of your choice. Only that one is a creature.
(wotc • 2018-01-19)
Animate Library can't enchant your Contraption deck.
(wotc • 2018-01-19)
Rulings
While your library is a creature, it can become enchanted or equipped, it can be tapped and untapped, and it can attack and block like other creatures.
(wotc • 2018-01-19)
If Animate Library leaves the battlefield, your library goes back to being a normal library.
(wotc • 2018-01-19)
If your animated library becomes four libraries because of Split Screen, Animate Library stays attached to one of them of your choice. Only that one is a creature.
(wotc • 2018-01-19)
Animate Library can't enchant your Contraption deck.
(wotc • 2018-01-19)