If the Battle Damage caused by this card is reduced to 0 (with the effect of “Kuriboh”, “Waboku”, etc.) its effect is not activated.
If this face-down Defense Position card is attacked by a monster with 0 ATK, its effect will activate, since Battle Damage was inflicted to the attacking player.
Netrep Rulings:
“Yata-Garasu’s” effect will activate when it inflicts any damage as a result of battle.
Netrep Q&As:
Q: If the player that controls “Yata-Garasu” repeatedly attacks his/her opponent’s Life Points to inflict Battle Damage over a period of so many turns and/or until his/her opponent’s Life Points reaches 0, will it be considered “stalling”?
A: Playing out the “Yata-Garasu” effect is NOT considered stalling. However, your opponent must be allowed to concede if he/she chooses and there is no foreseeable manner to avoid a game loss. But there should not be any coercion on either player’s part to sit through the effect multiple times or to be forced to play it out needlessly. bishop, 02/01/2004