Advanced format ruling
Twin-Shield Defender
Card effect (current official text)When this card you control is destroyed by battle and sent to your Graveyard, you can halve the current ATK of 1 face-up monster your opponent controls, until the End Phase.
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.