Citi CashReturns Credit Card (5% back for 3 months)

Hello, I was browsing https://www.citicards.com and saw that they had a new cashreturns card that gives 5% back for the first 3 months without any limits. Sounds like a great way to save money on a new car or boat if your in the market. You can get a 100k house for only 95k etc...