Advanced format ruling
Thunder King Rai-Oh
Card effect (current official text)Neither player can add cards from their Deck to their hand except by drawing them. During either player's turn, when your opponent would Special Summon exactly 1 monster: You can send this face-up card to the Graveyard; negate the Special Summon, and if you do, destroy it.
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.