Pay MSD or Invest Elsewhere

I just want to contribute my real life scenario to the thread as I’m currently shopping for a new MB.

With $6,500 in MSDs, I would save about $77 a month, or roughly a 14% rate tax-free. I’m canvassing for good credit card offers now to put that on and have found this with the Chase Freedom Unlimited card:
3% cash back in the first year up to $20K and 0% intro APR for 15 months. So that’s like getting a free loan to earn a 17% return for over a year with only the minimum payment due each month. When the intro APR ends I’d just pay off the balance.

The $6,500 saved from the CC could be collateral for selling 5 FCX 2021 $12 puts to collect a $1,300 premium. If the stock is above $12 I keep that. If not then it’s like I got a 19% discount from today’s price.