Instill Deletor, Ender (G-CMB01/S06EN)

[CONT]: Sentinel (You may only have up to four cards with "[CONT]:Sentinel" in a deck) [AUTO]:[Choose a card from your hand, and discard it] When this unit is placed on (GC) from hand, you may pay the cost. If you do, choose one of your vanguards that is being attacked, and that unit cannot be hit until end of that battle. Then, if you have a card named "Instill Deletor, Ender" in your drop zone, and your opponent's vanguard is deleted, at the end of that turn, delete all of your opponent's vanguards. (The deleted unit is turned face down, its power becomes 0 and it loses all text. It turns face up at the end of the owner's next turn)