REDU format ruling
Nutrient Z

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)During damage calculation, when you are about to take 2000 or more battle damage: Gain 4000 LP first.
Rulings
- 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.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.