Tengu 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.
Rulings
- You cannot activate Keldo's effect when there are not at least 2 cards in your opponent's GY.
- The owner of the Deck shuffles it and the controller of Keldo cuts the Deck.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.