Advanced format ruling
Dark Nephthys
Card effect (current official text)If you have 3 or more DARK monsters in your Graveyard and this card in your hand: You can banish 2 of them from your Graveyard; send this card from your hand to the Graveyard. During your next Standby Phase after this card was sent to the Graveyard by this effect: Special Summon this card from the Graveyard. When this card is Special Summoned: Target 1 Spell/Trap Card on the field; destroy that target.
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.