Tribute 1 Synchro Monster, then target 1 face-up card on the field; negate its effects (until the end of this turn), then if you Tributed a "White Forest" Synchro Monster to activate this effect, you can Special Summon 1 Illusion monster from your GY. If this card is sent to the GY to activate a monster effect: You can Set this card. You can only use each effect of "Scourge of the White Forest" once per turn.