Per DoCYou should be able to get 5x on Lyft by buying GCs at Starbucks. Plus you'll get a $5 Starbucks GC when you buy a $20 Lyft GC.
How are you getting 5x?
Use a Starbucks GC that you bought at Staples?
I think he means the freedom 5% (https://creditcards.chase.com/freedom/merchants), but I got a better deal by buying on Cardpool. You can probably get better discounts but I saw the email right in front of a Starbucks so I chose the most practical option.