If you take battle or effect damage while this card is in your GY: You can place this card from your GY in your Spell & Trap Zone as a face-up Continuous Trap. During the Main Phase, if this card is treated as a Continuous Trap: You can Tribute 1 "HERO" monster; Special Summon this card. If this card is Special Summoned from the Spell & Trap Zone: You can halve the ATK of 1 face-up monster on the field. You can only use each effect of "Vision HERO Poisoner" once per turn.