Reptyro Cryst – Glacial Devourer

Does an 【On Deploy】 ability activate even if the card is deployed from a zone other than the hand?

Yes, it activates. The 【On Deploy】 ability activates not only when deployed from the hand, but also when deployed from the deck, graveyard, or other zones by card effects.

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.

Can I choose not to activate an automatic ability whose trigger conditions have been met?

No, you cannot. It must always be activated.

I played an ability that states "Look at the top X cards of your deck," but the number of cards in my deck was fewer than X. In this case, can the effect still be resolved?

Yes, you can. Look at the remaining cards in the deck as much as possible and resolve the effect. Furthermore, even if the deck temporarily becomes 0 cards during the resolution of the effect, as long as there is 1 or more cards in the deck after the resolution finishes, you do not lose the game.

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 played a card that states 〈Look at the top X cards of your deck, choose up to Y (specific) cards and deploy them, and shuffle the rest of the cards with the deck〉. What happens if there are no such specific cards among the cards I looked at?

Choose 0 cards and resolve the rest of the effect.

Two structures with 【On Deploy】 【AUTO】 abilities were deployed by the 【ACT】 ability of BP01-030《Reptyro Cryst – Glacial Devourer》. In what order should these 【AUTO】 abilities be resolved?

Resolve them one by one in any order you choose. For example, if BP01-042 《Antique Mirror》 and TD01-019 《Antique Wooden Chair》 are deployed by the 【ACT】 ability of BP01-030 《Reptyro Cryst – Glacial Devourer》, you can resolve "Draw 1 card" and "Choose up to 1 Pal, and it gets Power@+1000 until end of turn" in whichever order you prefer.