<prompt> Human: What would be the current best option as far as cash rewards cards go right now? Is there any one card that does it all or well enough?? Ive just started reading and see some suggestions to use a combo of 2 cards. Till now Ive just used a BOA cash back card. 2017 Im trying to become extra responsible and be proactive.  <response>: If you shop at Costco the Citi doublecash plus the Citi Costco card is a powerful pairing. 4 on gas, 3 on dining and travel, and 2 everywhere else.I use those 2 plus a Chase Freedom 5 in a changing quarterly category. 