Powerline - World's Greatest Rock Star

Shift 4 (You may pay 4 Ink to play this on top of one of your characters named Powerline.)
Singer 9
[Mash-Up] Once during your turn, whenever this character sings a song, look at the top 4 cards of your deck. You may reveal a song card with cost 9 or less and play it for free. Put the rest on the bottom of your deck in any order.