in theory, you can tranfer many times, from card to card.

However, usually some concerns:

1) many same brand card will not allow you to transfer among them. For exmaple, the Visa card issued by one bank (or its mother organization).

2) be careful of the transfer fee. 0% does not mean no transfer fee.

3) be sure to pay it up all when the 0% ends, otherwise, the interets usually is calculated from the first day the card has balance, not from the date 0% end. So you may see a huge interets (over a year).

Correct if I am wrong.