Any Debit Card in malaysia can purchase Steam Wallet/game??
Currently , CIMB and Maybank block the transaction from steam , The offical say:

'Basically if the sites are non 3D secured sites, the bank will decline the transaction. It means that these merchants do not have the One Time Password authentication /MSOS (Maybankard Secure Online Shopping). The decision was made based on the security reason and to protect our customers' account from any fraudulent attempt. We place security as our utmost priority. '