Muashi, Ocean's Form

Protection from red, islandwalk
Whenever a basic Island enters the battlefield
under your control, if Muashi is in the command
zone, you may pay {1}{u}{u}{u}. If you do, put
Muashi from the command zone onto the battlefield.
{x}{u}{u}{u}: Shuffle target permanent with mana
value X into its owner's library. X can't be 0.