Advanced format ruling
Imprisoned Queen Archfiend
Card effect (current official text)During each of your Standby Phases, you must pay 1000 Life Points (this is not optional), or this card is destroyed. During your Standby Phase: Target 1 Level 4 or lower Fiend-Type monster on the field; that target gains 1000 ATK until the End Phase. "Pandemonium" must be on the field and this card must be in your Graveyard to activate and to resolve this effect.
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.