Lorelei, Siren of the Sea

Prowess, islandwalk
Whenever Lorelei, Siren of the Sea enters the battlefield or attacks, look at the top five cards of
your library. You may exile a noncreature card
with a music counter and put the rest on the top
or bottom of your library in any order.
{x}{x}{u}, {t}: you may cast {x} cards in exile with
music counter without paying their mana costs.