Advanced format ruling
Nightmare Archfiends

Card effect (current official text)Tribute 1 monster; Special Summon 3 "Nightmare Archfiend Tokens" (Fiend-Type/DARK/Level 6/ATK 2000/DEF 2000) to your opponent's field in Attack Position. Each time 1 is destroyed, its controller takes 800 damage.
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.