Covert Demonic Dragon, Magatsu Storm "Яeverse"

:When this unit is placed on by the ability of your vanguard with "Magatsu" in its card name, lock all of your rear-guards without "Magatsu" in their card names, and all of your units get +5000 until end of turn. If your opponent's vanguard is grade 3 or greater, [ 1 & discard two cards from your hand], and you perform drive checks for the battles this unit attacked until end of turn. :When this unit is retired from during your opponent's turn, 1, put this card into your hand, your opponent chooses a card from their hand, and discards it.