Advanced format ruling
Mystical Cards of Light
Card effect (current official text)You cannot use 1 of your Spell & Trap Card Zones. During your Draw Phase, if you control another "Mystical Cards of Light", you can draw 2 cards instead of 1 for your normal draw.
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.