Advanced format ruling
Jowgen the Spiritualist
Card effect (current official text)You can discard 1 random card from your hand to the Graveyard; destroy all Special Summoned monsters on the field. Neither player can Special Summon monsters.
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.