Advanced format ruling
Jester Lord
Card effect (current official text)While this card is the only monster on the field, it gains 1000 ATK for each card in the Spell & Trap Card Zones.
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.