Advanced format ruling
Montage Dragon
Card effect (current official text)Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by sending 3 other monsters from your hand to the Graveyard, and cannot be Special Summoned by other ways. This card's ATK becomes the combined original Levels of the sent monsters x 300.
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.