REDU format ruling
Needle Wall

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Once per turn, during your Standby Phase: Roll a six-sided die. Treat your opponent's Main Monster Zones as numbers 1-5, counting from your right, and destroy the monster that is in the same Main Monster Zone as the result. If the result is 6, roll again.
Rulings
- If you have multiple Needle Walls, roll a die for each.
- If you activate this card (flip it face-up) during your Standby Phase, you still roll during that same Standby Phase.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.