Shadowbeak – Seed of Despair

What is night?

This is a game state that changes via card effects. Being "night" does not inherently trigger any rules by itself, but certain cards have abilities that activate or become active while it is night. Additionally, if either player changes the state to night, the abilities of both players that become active while it is night become active for that duration.

With an ability that states "Choose up to X cards," can I choose 0 cards?

Yes, you can. Even if there are eligible cards to choose, by choosing 0 cards, you can effectively choose not to select any.

What is 〈Butcher〉?

It means putting the specified number of Pals in the Base into the graveyard. For 〈Choose 1 of your Pals, and butcher it〉, choose 1 Pal in your Base and put it into the graveyard.

Does the ability 〈【CONT】 If it is night, your Pal's 【AUTO】 abilities activate twice〉 of BP01-074 《Shadowbeak – Seed of Despair》 cause this card's own 【AUTO】 ability to activate twice?

Yes, it activates.

I have a copy of BP01-074 《Shadowbeak – Seed of Despair》 in the rest state and BP01-075 《Katress – Abyssal Sorcerer》 in my base, and no effect other than 《Shadowbeak – Seed of Despair》 is causing it to be night. If 《Shadowbeak – Seed of Despair》 is butchered in this state, how many times does the 【AUTO】 ability of 《Katress – Abyssal Sorcerer》 activate?

It activates twice.

I have a copy of BP01-074 《Shadowbeak – Seed of Despair》 in the rest state and BP01-075 《Katress – Abyssal Sorcerer》 in my base, and no effect other than 《Shadowbeak – Seed of Despair》 is causing it to be night. In this state, 《Shadowbeak – Seed of Despair》 was butchered by its own 【AUTO】 ability at the end of the turn. In this case, how many times does each 【AUTO】 ability activate, and in what order should they be resolved?

First, at the end of the turn, the 【AUTO】 ability of 《Shadowbeak – Seed of Despair》 activates twice and enters a pending state. By resolving one of the pending 【AUTO】 abilities of 《Shadowbeak – Seed of Despair》 and butchering 《Shadowbeak – Seed of Despair》, the 【AUTO】 ability of 《Katress – Abyssal Sorcerer》 activates twice (factoring in the 【CONT】 ability of 《Shadowbeak – Seed of Despair》) and enters a pending state. After the resolution of the first 【AUTO】 ability of 《Shadowbeak – Seed of Despair》, you can resolve the remaining one 【AUTO】 ability of 《Shadowbeak – Seed of Despair》 and the two 【AUTO】 abilities of 《Katress – Abyssal Sorcerer》 in any order.

I have two copies of BP01-074 《Shadowbeak – Seed of Despair》 in my Base, and 〈【CONT】 If it is night, your Pal's 【AUTO】 abilities activate twice〉 is active. The 【AUTO】 ability of 《Shadowbeak – Seed of Despair》 triggers at the end of the turn; how many times does the 【AUTO】 ability activate?

It is twice. The ability 〈【CONT】 If it is night, your Pal's 【AUTO】 abilities activate twice〉 of 《Shadowbeak – Seed of Despair》 does not add +1 to the number of activations; rather, it is an ability that causes an 【AUTO】 ability to activate twice whenever it triggers once.

Does the ability 〈【CONT】 If it is night, your Pal's 【AUTO】 abilities activate twice〉 of BP01-074 《Shadowbeak – Seed of Despair》 cause 〈【AUTO】 Breakthrough (When the opposing combat Pal is put into the graveyard during this card's attack, deal damage to the opponent player)〉 to activate twice?

Yes, it activates.