Holy Seraph, Parashel (G-BT13/029EN) [Ultimate Stride]

[ G guardian ] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone is 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. [CONT](GC):During the battle that your opponent's vanguard attacked, if the number of face down cards in your damage zone is two or more, this unit gets [Shield]+10000, then, if the number of face down cards in your damage zone is three or more, this unit gets [Shield]+10000.