Cardfight!! Vanguard - Future Card Buddyfight - Hundred Demons Sorcery, Rineryusho (C) DZ-TB01/124EN

Choose one of your rear-guards. If you chose a card, retire that unit, and put the top card of your deck into gauge face down. [CONT]:During your opponent's turn's guard step, this card can be called to (GC) as a trigger unit, and it becomes a Grade 0/[Shield]15000 guardian.