NOTE: "Double Tool C&D" can be only equipped to a monster you control. If control shifts to the opponent, "Double Tool C&D" will be destroyed.*
A monster equipped with "Double Tool C&D" only negates a monster's effect during your turn while the 2 monsters are battling. This means that it only negates effects that activate on the field, or are continuous effects while on the field. Effects that activate in the Graveyard like "Sangan" are not negated.
"Double Tool C&D's" effect that destroys a monster during the opponent's turn starts a Chain.
If, during your opponent's turn, the opponent's monster attacks your monster equipped with "Double Tool C&D," and is destroyed by battle, the effect of “Double Tool C&D” that would destroy that monster does not activate.*
If you have 2 monsters, each equipped with "Double Tool C&D", your opponent cannot attack.
Mentions in Other Rulings
Power Tool Dragon: When "Power Tool Dragon," equipped with "Double Tool C&D," is destroyed by battle during your opponent's turn, and you send "Double Tool C&D" to the Graveyard instead to protect “Power Tool Dragon,” the effect of “Double Tool C&D” that destroys the opponent’s monster does not activate, because it is not on the field at the end of the Damage Step.*
Otra noticia así destacada (por lo menos para mi que me encanta este monstruo) que en USA no es legal usar al "Heroe Elemental Zero Absoluto" ni tampoco en el evento anterior que comente.
Ahora os pongo los textos donde he sacado esta información (Konami) y el link:
* UPDATE 11/10 * Please note that the Forbidden & Limited Cards List is up-to-date and that NO cards from Hidden Arsenal are Forbidden, Limited, or Semi-Limited! You can find the latest Forbidden & Limited List here.
“Elemental Hero Absolute Zero” is not currently legal for play in North America, and will not be legal for play at this event.Please check the “Products” page online at http://www.yugioh-card.com/en/products/ for an updated look at the legality dates of Yu-Gi-Oh! 5D’s product releases, prior to attending the event.