Ideally you cannot add two standard controllers to a single visualforce page however you can add extensions and make it work as standard controllers by defining standardcontrollers and standardsetcontrollers within apex. The below post might help
Ideally you cannot add two standard controllers to a single visualforce page however you can add extensions and make it work as standard controllers by defining standardcontrollers and standardsetcontrollers within apex. The below post might help
You can't add two standard controllers to one page. And you are saying that you know that you can do it with extensions which is also wrong. You can bind StandardObjects or custom objects to a standardcontroller, apex classes to extensions but not obects.
https://developer.salesforce.com/forums?id=906F000000096v4IAA
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https://developer.salesforce.com/forums?id=906F000000096v4IAA