Million-Century Ice Prison (MP24-EN377) [25th Anniversary Tin: Dueling Mirrors]

During the Main Phase, if a monster(s) you control leaves the field by an opponent's monster effect, except by being destroyed: Activate 1 of these effects;<br>• End the Main Phase.<br>• Skip Main Phase 1 of your opponent's next turn.<br>You can only activate 1 "Million-Century Ice Prison" per turn.