Advanced format ruling
Keldo
Card effect (current official text)When this card is destroyed and sent to the Graveyard as a result of battle, select 2 cards from your opponent's Graveyard, add them to your opponent's Deck and the Deck is then shuffled.
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.