American Express has increased the signup bonus for the Mercedes-Benz Platinum Card to 75,000 MR points after $3,000 spend in 3 months. This card comes with a $475 annual fee. For this card to make sense, you’ll probably want to be a heavy user of Centurion lounges and also see this post on how to best use the airline incidental fee credit (if you aren’t spending $200 on airline incidental fees each year).
Chase has also increased the signup bonus for the Ink Plus Card to 70,000 UR after $5,000 spend in 3 months; however, the increased bonus is not available online, and you must apply in-branch.