When your opponent activates a card or effect: You can return 1 "Springans" Xyz Monster you control to the Extra Deck, then apply 1 of these effects.
● Negate the activated effect.
● Special Summon 1 Level 8 monster from your GY.
If a face-up Xyz Monster(s) you control leaves the field by card effect (except during the Damage Step): You can have all monsters your opponent currently controls lose 1000 ATK until the end of this turn (even if this card leaves the field). You can only use each effect of "Springans Interluder" once per turn.