Here's why:
* White Night Dragon's effect is a "Counter Trap" effect. This means it can only be activated in response to an opponent's effect that is already being activated, specifically an attack declaration in this case.
* Chain Link 1 is always the effect being responded to. In this case, the opponent's attack declaration would be Chain Link 1.
* Chain Link 2 and onwards can be any card that can respond to the effect being chained to.
Cards that can be chained to White Night Dragon's effect:
* Spell/Trap cards that can be activated in response to an attack declaration. For example:
* Solemn Judgment: This can negate an attack and destroy the attacking monster.
* Torrential Tribute: This can destroy all monsters on the field.
* Breakthrough Skill: This can destroy the attacking monster.
* Monster effects that can be activated in response to an attack declaration. For example:
* Effect Veiler: This can negate the attacking monster's effect.
* Ghost Ogre & Snow Rabbit: This can banish a card on the field.
* Cyber Dragon Infinity: This can negate the attacking monster's attack.
Cards that cannot be chained to White Night Dragon's effect:
* Cards that can only be activated during the Main Phase. These cannot be chained to an effect that happens during the Battle Phase.
* Cards that can only be activated during a specific time, not in response to an effect. For example, a card that can only be activated during your turn cannot be chained to White Night Dragon's effect.
Important Note: Remember to check the specific timing and conditions of each card's effect to determine if it can be chained to White Night Dragon's effect.