REDU format ruling
Sasuke Samurai

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)At the start of the Damage Step, if this card attacks a face-down Defense Position monster: Destroy that face-down monster.
Rulings
- If Sasuke Samurai attacks a face-down monster, apply its effect after entering the Damage Step, but before flipping up the face-down monster. The monster is not flipped. Flip Effects are not activated. Monsters like Kisetai and Giant Axe Mummy do not activate their effects.
- If Sasuke Samurai attacks a face-down monster, there is no damage calculation. Sasuke Samurai destroys the monster before damage calculation is reached.
- If Sasuke Samurai destroys a face-down monster using its effect, the face-down monster is NOT destroyed as a result of battle, it is destroyed by Sasuke Samurai’s effect. So Mystic Tomato, Helpoemer, etc. will not activate their effects. However, monsters like Sangan will still activate their effects.
- If Sasuke Samurai attacks a face-down monster, and Ceasefire is activated during the Battle Step to flip it face-up, Sasuke Samurai does not destroy it with its effect and damage calculation is applied normally. The monster must be face-down at the beginning of the Damage Step in order for Sasuke Samurai to activate its effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.