Star-vader, Blaster Joker

:[Legion 20000]"Companion Star Star-vader, Photon"(If your opponent's vanguard is grade 3 or greater, this unit may return four cards from your drop zone into your deck once, search your deck for the specified card, and Legion) :[ 2 & 2 & Choose one of your rear-guards with "Star-vader" in its card name, and lock it] If this unit is [Legion], lock all of your opponent's rear-guards, choose one of your opponent's legion mates, and retire it. :[Choose a card with the same card name as a unit on your from your hand, and put it into your soul] When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets +1 until end of that battle.