Any Oracle cards could be used and I have a Moonology deck myself but if you want something for twin flames this tool has a specific Oracle cards for separation and you can use them free or get readings done for you.
In my experience, people disagree about Oracle cards even more than traditional Tarot, so you might get different opinions. I like more open-ended Oracles so you can weave a meaning with a combination of cards.
There were some Oracle suggestions on this thread too