Advanced format ruling
Sanguine Swamp
Card effect (current official text)If you control any other Spell or Trap Cards, destroy this card. Face-down Spell and Trap Cards cannot be activated. Destroy this card during your 2nd Standby Phase after activation.
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.