Mier Filen, Banished Prince

Tap five snow lands you control: Target player
reveals the top card of their library. If it is a land
card, exile it. If it is a non-land card, put it into
play under that player's control.
Land cards exiled by Mier Filen may be tapped
for {1} as long as Mier Filen is on the battlefield.
He was allowed to go anywhere, except home.