Advanced format ruling
Serpentine Princess
Card effect (current official text)If this face-up card is returned from the field to your Deck, select and Special Summon 1 Level 3 or lower monster from your Deck to your side of the field. Then shuffle your Deck.
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.