This card can only be activated during your opponent's Damage Step during the "Calculate and Apply Damage" portion or at any point in the Damage Step prior to that.

You must take the 2000 points or more of Battle Damage from a single attack. If you take 1000 points of damage from one attack, and then 1200 points of damage from a second attack, the effect of this card will not activate.

If "Hayabusa Knight" attacks you directly twice, the effect of this card will not activate. The Battle Damage must come from a single attack, not a single monster attacking twice.

You can activate 2 copies of "Nutrient Z" and you will gain 8000 Life Points if you would take 2000 points or more of Battle Damage.

You cannot activate "Kuriboh" in a chain to "Nutrient Z"s effect. The effect of "Kuriboh" would reduce the Battle Damage to 0, and then the effect of "Nutrient Z" will no longer increase you Life Points. You must actually take the damage to gain the benefit of "Nutrient Z"s effect.

Bad Reaction to Simochi: If the opponent activates "Nutrient Z" in the Damage Step, you cannot chain "Bad Reaction to Simochi" since it cannot be activated in the Damage Step. If "Bad Reaction to Simochi" was already active on the field, its effect would apply to "Nutrient Z".

Talisman of Trap Sealing: If you have "Talisman of Trap Sealing" and "Sealmaster Meisei" is destroyed in a battle that causes you to take 2000 or more damage, you cannot activate "Nutrient Z".