Advanced format ruling
Alien Brain
Card effect (current official text)When a Reptile-Type monster you control is destroyed by battle with an opponent's attacking monster and sent to the Graveyard: Take control of the opponent's monster, and if you do, it becomes Reptile-Type.
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.