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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL