Secret Sanctuary of the Spellcasters

Regarding the effect "When a Spell Card other than this card is face-up only on your side of the field, and a monster other than a Spellcaster-Type monster is Normal or Special Summoned to your opponent's side of the field: That monster cannot attack, and its effects cannot be activated this turn":

This is an effect that starts a Chain Link, activated by this card while it is face-up in the Spell & Trap Zone.

This effect does not target.

This effect activates automatically when a monster other than a Spellcaster-Type monster is Normal or Special Summoned to your opponent's Monster Zone. (It also activates during the Damage Step.)

This effect also activates if a monster is Special Summoned to your opponent's Monster Zone in face-down Defense Position. (It also activates and is applied even if that monster is a Spellcaster-Type monster.)

【Regarding the effect "If you do not control a Spellcaster monster, destroy this card"】

This is an effect that does not start a Chain Link, applied by this card while it is face-up in the Spell & Trap Zone.

This is also applied during the Damage Step.