At least this resonates as being generally about right:
You can sign up for the Amex Gold Premier Rewards Card (here) and you’ll receive 15,000 bonus Membership Rewards points after $1,000 in spend. After you apply and are accepted, you can wait 24-48 hours until the card is in the system then you can call them and ask them to apply promo code 6661 to your account. That will bump your bonus up from 15k points to 75k points. There is some misinformation out there about using this code to add authorized users to your account. Ignore that. The authorized users bonus (10k per authorized user) is apparently expired. Code 6661 will get you the 75k points with $1,000 in spend, no other users necessary.
You can then call back or secure message them and ask for code 6664 to be added to your account. 6664 will get you 10k bonus points PER BILLING CYCLE for using the card 15 times within the billing cycle (NOT WITHIN THE MONTH) through November 15th. You’ll see this mentioned as a 50k point bonus, but at this point you cannot get the full 50k since it’s already August and, again, we’re looking at billing cycles, not months.
No guarantees this will work, of course. But the American Express Premier Rewards Gold card is one of the best cards out there these days with double miles on gas and groceries, triple miles on airfare, and the high value of the American Express Membership Rewards program which has instantaneous transfers to many mileage programs and frequent transfer bonuses.