I have never known what's the exact ruling on this card, I know it switches the original atk and def, then increases and decr. are reapplied... does somebody know if it works with catnipped kitty (reduce def to zero and then shield & sword to get a zero atk monster) ? I ask this because I heard that when it says in the card "attack increase" its treated different than when it says "attack become"

When Shield & Sword activates, it swaps the ATK and DEF of all monsters, and then some monsters actually reapply the effect to themselves. Chaos Necromancer is an example of this.

However with Catnip Kitty, its changes lowers the DEF of a monster once for that turn and that it is. It doesn't get to continuously check the DEF of that monster. So if you hit up a Goblin King, Chaos Necromancer, etc. with a Catnip ball, then Shield & Sword them, they will get to reapply their effect to themselves and have their ATK raised again.

For example

You have a Summoned Skull equipped with Sword of Dark Destruction

Opponent activates Shield and Sword

The ORIGINAL ATK/DEF of Summoned Skull (2500/1200) is swapped so it's (1200/2500) and THEN you recalculate the effects of Sword of Dark Destruction to raise its ATK by 400 and lower its DEF by 200 so its new stats would be (1600/2100).

With Catnipped Kitty, it makes the DEF of the monster 0 while Shield and Sword switches the ORIGINAL ATK/DEF of monsters. The original attack is what is printed on the card, NOT modified stats so whatever the DEF is on the card becomes its ATK and then the DEF is 0 still.

Umm HalfDemonInuyas.. u mite wanna use a calc next time =] unless theres something i missed.. 2500*def* minus 200 is 2300.. not 2100?