Digtoise – Keen Needleback

What are 【Material】 and 【Ingredient】?

These are information of a player. 【Material】 and 【Ingredient】 by themselves do not hold any special abilities, but they may be gained or consumed by card abilities.

I have multiple copies of the same card with a [Once Per Turn] ability in my base. Can the [Once Per Turn] ability be activated once for each individual card?

Yes, it can be activated. For example, if you have multiple copies of TD01-008 〈Stone Pit〉 in your base, even if you activate the 【ACT】 ability of 〈Stone Pit〉 A, you can still activate the 【ACT】 ability of 〈Stone Pit〉 B.

I have a copy of BP01-033 《Wumpo – Frostpeak Sentinel》 in the rest state in my base. It is put into the graveyard due to an attack from an opponent's Pal with 〈【AUTO】 Breakthrough (When the opposing combat Pal is put into the graveyard during this card's attack, deal damage to the opponent player)〉. The 【Strike】 of the Pal with 〈Breakthrough〉 was reduced by 1 due to the 【CONT】 ability of 《Wumpo – Frostpeak Sentinel》, making it 2 instead of 3. In this case, is the damage dealt by Breakthrough 2 or 3?

It becomes 2.

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.