Star-vader, Venom Dancer (RRR)

[ACT](VC): Legion20000 Star-vader, Sword Viper (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)
[AUTO](VC):[Counter Blast (1)] At the end of the battle that this unit attacked a vanguard, if this unit is Legion, you may pay the cost. If you do, for each of your opponent's locked cards, choose up to one of your rear-guards, and [Stand] it.
[ACT](VC):[Counter Blast (1)-card with Star-vader in its card name] If you have another unit in your middle column, 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 the end of the owner's turn.)