[ACT] [(RC)]: If you have a grade 3 or greater vanguard with "Seraph" in its card name, and you did not ride this turn, [COST] [Retire this unit], search your deck, hand, or drop for up to one grade 4 unit card with "Seraph" in its card name, ride it as [STAND], and if you searched the deck, shuffle the deck. Of you rode the card, your opponent choses a card from their drop imprisons it in your prison, and the cost of the original [AUTO] ability of that ridden unit decreases by [Counter-Blast 1] until end of turn.