Advanced format ruling
Ballista of Rampart Smashing
Card effect (current official text)If the equipped monster attacks a face-down Defense Position monster, it gains 1500 ATK during damage calculation only.
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.