[G guardian] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone if three or less)-Opponent Turn's Guard Step-[Choose a card with "Heal" from your hand, and discard it] Call this card to your (GC) from face down. [AUTO]:[Counter Blast (1)] When this unit is placed on (GC), you may pay the cost. If you do, choose one of your opponent's attacking rear-guards, and retire it.