Restless Muse

Bestow {4}{g}{w}{u}
Flying
When Restless Muse enters the battlefield, each player may search their library for a basic land card and put it onto the battlefield tapped. Then each player who did shuffles their library.
Enchanted creature gets +4/+4 and has flying.
(If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)