American express blue business card

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In my opinion this is a must have. It gives 2 points per dollar on all purchases up to $50,000. It is a business card so it doesn't go on your 5/24 for chase. It is a perfect card to keep open if you want to accumulate Amex  points. That involves opening expensive cards that for many are only worth it the first year. This is a perfect no annual fee card that you can keep opens. It also has a great referral rate of 10,000-15,000 points for the referrer. This card usually doesn't have a public opening bonus but does have one through a referral link.