Advanced format ruling
Dark Snake Syndrome
Card effect (current official text)During each of your Standby Phases: Inflict damage to both players. This damage begins at 200 and is doubled during each of your following Standby Phases.
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.