You can banish this card from your GY, then target 1 Reptile monster you control and 1 face-up monster your opponent controls, to activate 1 of these effects;
• Change those monsters to face-down Defense Position.
• Destroy that monster you control, and if you do, change the ATK of the other monster to 0 until the end of this turn.
You can only use this effect of Yamorimori once per turn.