If you wish to pass, all you need to do is pay a suitable cost.
[G Guardian]-Opponent Turn's Guard Step-[COST][Discard a card with [Heal] from your hand], and call this card to your (GC) from face down. [AUTO]:When this unit is put on (GC), [COST][Soul-Blast 1]], and this unit gets [Shield] +30000 until end of that battle. Your opponent chooses any number of their rear-guards, and [Rest] them. This unit gets [Shield] -10000 until end of that battle for each unit [Rest].