Advanced format ruling
Archfiend's Oath
Card effect (current official text)Once per turn: You can pay 500 Life Points, then declare 1 card name; excavate the top card of your Deck, and if it is the declared card, add it to your hand. Otherwise, send it to the Graveyard.
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.