Researching another post, I tried to include a link to the Platinum Card from American Express Exclusively for Mercedes-Benz because it was the best personal sign up bonus for Membership Rewards at 50,000 Membership Rewards for spending $3k in three months.

If the Mercedes-Benz version of the card is dead, then the best Platinum card offers is the standard offer of 25,000 Membership Rewards after spending $2k in three months.

Sure there is a $450 annual fee--the Mercedes card had a $475 annual fee--but you can get easily more than $500 in statement credits plus worldwide airport lounge

1. Your Platinum Card's Membership Rewards will drop in value for Pay With Points redemptions on February 15, 2013 from 1.25 cents to 1 cent. This is pretty close to not being newsworthy, since Pay With Points is a bad deal at 1.25 cents. I'd rather transfer to Avios, Hawaiian Airlines, or even top off a Delta account before buying a cash ticket with Membership Rewards.

The Points Guy reports that you can call AMEX to cancel your Platinum card until December 30 at 800-525-3355 and receive a prorated refund of the $450 annual fee.