The gallery is perfectly safe. It is perfectly safe because he is there.
[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][put one or more cards from your hand into your soul], and this unit gets [Shield] +10000 until end of that battle for each card put into your soul for this cost. If you put two or more cards into your soul for this cost, your opponent chooses one of their [Stand] rear-guards, and puts it into their soul.