Advanced format ruling
Bad Reaction to Simochi
Card effect (current official text)As long as this card remains face-up on the field, any effect of increasing your opponent's Life Points is changed to inflict the same amount of points in damage to your opponent's Life Points.
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.