魔法が使えたらな、と思うことはありますか？って英語でなんて言うの？

This is an informal way to ask someone if they would like to use magic. I hope that this helps :)

Sometimes we all want something special to happen and be able to go something using magic so you would ask 'do you ever wish you could use magic?

"Do you sometimes wish you had powers?" This is a very straightforward way to ask the question you are wanting to get more information on. Adding terms like "sometimes" to questions like this can make the question more passive and less invasive. If you are asking your reader/listener something about a sensitive topic or similar, doing this might open or start the conversation more freely. "Wouldn't it be nice if we could use magic?" This question involves everyone in the conversation. You are suggestive and this is an easy way to start a conversation instead of being direct. Using "we" and "wouldn't it be nice" are considered conversation tools used to start a conversation and get people talking.

The 'dark arts' simply refers to 'occult practices' that include magic or alchemy. 'Whip out' is a phrase that means 'to suddenly proffer' or 'to suddenly utilize' -- e.g.: 'When she saw the attacker, she whipped out her knife.'

When talking about magic, you want to ask someone if they ever wished they could use magic.. Either of the above examples will suffice.

Magic is a very interesting topic that not many people find interest in. To ask someone if they would use magic, use the sentences above. Magic has some very specific traits and rules and keeping a magic journal is always a great idea to keep track of your work. Esoteric: hidden knowledge understood by a select few who study it.