The credit card is needed for verification purposes. It will not be charged if you are using the free 10 day trial.

However, there seem to be some discussion about malaysians are not suppose to use the free trials and may get their accounts banned after upgrading to a normal one. So...I guess you can try using the free trial (but must have a credit card although it will not be charged) then if you really wanna play, then I suggest you get a starter pack and created ANOTHER account just to be safe.