I have about 10. Each one paid me roughly $200 each upon opening in some form of bonus and to maximize the 5% bonuses.

Used to travel a lot for work so I had the Delta Amex for the earlier boarding, bonus miles, and free checked bags and the Holiday Inn card which easily paid for itself over the years.

Had the Uber card back when that was around which had 3% or 5% back on restaurants in the form of Uber credit which I used for work travel.

Amazon card of course for the 5% back there. Walmart too for the same reason.

Amex Blue for back in the day with the small business Satursday promos.

Amex Business for the 5% back on telco services.

Chase Freedom.

Discover IT.