I got Magnus on a Pre-Approved basis, no documents required. The only previous relationship I had with Axis was an Axis Vistara Platinum card and a normal savings account with not too much balance maintained.
You can check if you have it pre-approved for you by logging into the app, go to "Apply Now" and select "Credit Cards". This will give you a list of all the cards you are pre-approved of. If you see Magnus there, just click on apply now, you will get a OTP to confirm and you'll receive the approval message within 30-60mins