Advanced format ruling
Lifeforce Harmonizer
Card effect (current official text)When your opponent activates a card's effect that inflicts damage, you can discard this card to negate its activation and destroy it.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.