Is it permissible to open a current account in Bank Misr (Islamic Transactions Branch) to obtain a Visa card that enables online purchases, knowing that the account accrues variable interest described as Islamic Murabaha? Is this interest halal or not? And are the transactions of this branch free from usury?

There is no objection to dealing with the Egyptian Islamic Transactions Bank branch if its transactions are Sharia-compliant, such as the card being covered and the fees being fixed. It is better to verify this by checking with the bank, especially if it has a reliable Sharia board. As for variable rates, there is no objection to them if they result from a legitimate Mudarabah contract and investment in permissible fields; otherwise, they are prohibited usurious interests.