Advanced format ruling
Gilasaurus
Card effect (current official text)You can Special Summon this card (from your hand). If Summoned this way: Activate this effect; your opponent can Special Summon 1 monster from their GY.
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.