Would be great if you could could establish rules for which card is charged for a given transaction.
Wholefoods always goes to my Amazon Prime Visa
Restaurants always go to my credit card that has 5X points on restaurants
Changes in NY City always go to my business card
You could do rules based on specific businesses, categories of business, geolocation, time of day, dollar amount, merchant currency, or even more complicated things like charge to a specific card until a dollar amount is reached, or a mixture of AND/OR rules based on the above criteria.