Zulkaorom, Third Ethereal

As an additional cost to cast Zulkaorom, Third Ethereal, sacrifice three legendary creatures with total converted mana cost of 26 or more.
When Zulkaorom enters the battlefield, if its cost was paid, take control of target opponent for as long as you control Zulkaorom, Third Ethereal.
As long as you control another player, Zulkaorom, Third Ethereal has ethereal.