Astro Reaper and Dark Zodiac

Star-vader, Astro Reaper
[AUTO](RC):[Soul Blast (1)] When this unit’s attack hits a vanguard, you may pay the cost. If you do, look at five cards from the top of your deck, search for up to one card with the same name as a unit in your (VC), reveal it to your opponent, put it into your hand, and put the rest on the bottom of your deck in any order.

Star-vader, Dark Zodiac
[ACT](VC): Legion 20000 “Star-vader, Astro Reaper" (If your opponent has a grade 3 or greater vanguard, only once, this unit may return four cards from your drop zone to your deck, and search your deck for the specified card, and perform Legion.)
[AUTO](VC):[Counter Blast (1)] When this unit performs Legion, you may pay the cost. If you do, all of your opponent’s locked cards cannot be unlocked during your opponent’s next end phase.
[ACT](VC):[Choose one card with the same name as a unit in your (VC) from your hand, and discard it] Choose a rear-guard from your opponent’s front row and back row, and lock them. This ability cannot be used for the rest of that turn. (The locked card is turned face down, and cannot do anything. It turns face up at the end of the owner’s turn.)