Spell. Trigger-likeContinuous-like. Field. 5D'sTagForce6. If the turn player Summons exactly 1 monster: Destroy that monster, and if you do, Special Summon 1 "Mask Token" (Spellcaster/DARK/Level 1/ATK ?/DEF ?) to the destroyed monster's controller's field. Its ATK/DEF become the ATK/DEF the destroyed monster had on the field, but it cannot attack directly. You can only use this effect of "Ecole de Zone" once per turn. If this face-up card leaves the field, destroy all "Mask Tokens" on the field.