If you were going to do this, what card would you use?
Do any credit card companies have restrictions on bitcoin purchases?
Which cards offer incentives and bonus dollars for purchases?
The first rule of investing is to only invest what you can afford to lose, if you are thinking in using credit cards or any other kind of credit then it means that you cannot really afford to lose that money and if you do lose it, something quite likely taking into account that you are violating such a common sense rule, then you will be in deep trouble, I know that people are excited about the current price of bitcoin but that is not an excuse to take bad decisions with your money.