Star-vader, Dust Tail Unicorn

:Forerunner (When a unit of the same clan rides this unit, you may call this unit to ):[ 1 & Put this unit into your soul] If you have a Link Joker vanguard and your opponent has a locked card, choose one of your opponent's rear-guards, and lock it. (The locked card is turned face down, and cannot do anything. It turns face up at end of the owner's turn.)