Advanced format ruling
Vanguard of the Dragon
Card effect (current official text)You can send 1 Dragon-Type monster from your hand to the Graveyard; this card gains 300 ATK. When this card you control is sent to your Graveyard by your opponent's card effect: You can target 1 Dragon-Type Normal Monster in either player's Graveyard; Special Summon that target.
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.