Star-vader, Imaginary Plane Dragon

[ACT](VC): Legion20000 "Flash Gun Star-vader, Osmium" (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) [ACT](VC):[Counter Blast (2)] If this unit is Legion, for each unit in your middle column with "Star-vader" in its card name, choose up to 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 the end of the owner's turn.) [AUTO](VC):When this unit attacks a vanguard, this unit gets [Power]+2000 until end of that battle.