Resonations of Fasiliti

When Resonations of Fasiliti enters the battlefield, exile all Echoes you don't control. Opponents can't play Echoes until it leaves the battlefield.
Joseph planeswalkers cost {w}{u}{b} less to cast.
"I remember Fasiliti, how it got reduced to ashes before my very eyes. Seeing its image in the horizon give me hope, even if I know it's not real."
-Joseph, Tommia's Sanction