Star-vader, Nebula Lord Dragon

(This ability is active if you have four or more damage):During your turn, all your front row Link Joker get +3000 for each of your opponent's locked cards. : 2 Choose one of your opponent's rear-guards in the back row, 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.) /:Lord (If you have a unit without a same clan as this unit, this unit cannot attack)