Advanced format ruling
Drill Synchron
Card effect (current official text)If a Warrior-Type monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent. Once per turn, when you inflict battle damage to your opponent with this effect: You can draw 1 card.
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.