Advanced format ruling
Mid Shield Gardna
Card effect (current official text)Once per turn, you can flip this card into face-down Defense Position. Negate the activation of any Spell Card that targets this 1 face-down monster. At that time, flip this card into face-up Defense Position.
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.