Fairy Box

Edison Card Text
Each time a monster on your opponent's side of the field attacks, toss a coin and call Heads or Tails. If you call it right, the attacking monster's ATK becomes 0 only during the Battle Phase. Pay 500 Life Points during each of your Standby Phases. If you cannot, this card is destroyed.
Labyrinth of Nightmare • 2004-12-01
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
After Fairy Box checks ATK, which effects can still modify ATK in the Damage Step?!
A battle reaches damage calculation and Fairy Box is involved.
Only effects that are legal in damage calculation (like Honest, Kalut, or Injection Fairy Lily) can be activated, and there is only one manual chain in substep 4.
How do Fairy Box and Sasuke Samurai #4 resolve in the Battle Phase, and can multiple Fairy Box effects chain?!
An attack is declared while Fairy Box and Sasuke Samurai #4 are on the field.
Fairy Box activates at attack declaration in the Battle Step, while Sasuke Samurai #4 activates in the Damage Step. Multiple Fairy Box effects can chain because they are mandatory.
Rulings
edisonformat.net
●If you have two copies of Fairy Box active on the field you may flip a coin twice, but only need to call 1 correctly to reduce the attacking monster’s ATK to 0.
●The current ATK is reduced to 0, including all Equip Spell Cards. Trap Cards and Quick-Play Spell Cards can't further increase the monster’s ATK this battle. A monster effect such as Injection Fairy Lily can increase its own ATK after Fairy Box is successful.
●Paying 500 Life Points is optional, if you choose not to pay Fairy Box is destroyed.
●The effect of Fairy Box does not target, so Lord of D. won't prevent Fairy Box from reducing the ATK of an attacking Dragon-Type monster to 0.
edisonformat.com
If you have two copies of "Fairy Box" active on the field you may flip a coin twice, but only need to call 1 correctly to reduce the attacking monster’s ATK to 0.
The current ATK is reduced to 0, including all Equip Spell Cards. Trap Cards and Quick-Play Spell Cards cannot further increase the monster’s ATK this battle. A monster effect such as "Injection Fairy Lily" can increase its own ATK after "Fairy Box" is successful.
Paying 500 Life Points is optional, if you choose not to pay "Fairy Box" is destroyed.
The effect of "Fairy Box" does not target, so "Lord of D." will not prevent "Fairy Box" from reducing the ATK of an attacking Dragon-Type monster to 0.