Continuous. "Exosister" monsters you control cannot be targeted by monster effects from monsters that were Special Summoned from the GY. You can only use each of the following effects of "Exosister Carpedivem" once per turn. If you Xyz Summon an "Exosister" monster: You can declare 1 card name; for the rest of the turn, negate the activated effects, and the effects on the field, of cards with that original name. When an attack is declared involving your "Exosister" monster: You can target 1 Spell/Trap your opponent controls; destroy it.