If you go to Tools | Options | Environtment | Keyboard | Editor | Clipboard you will see the option CycleClipboardRing .
According this you can use it with v+shift+control but if you copy a text and try to use v+shift+control you always get something like the code below:
{\rtf\ansi{\fonttbl{\f0 Courier New;}}{\colortbl;\red0\green0\blue0;}
\f0\fs20\uc0 \cf1 test}
WORKAROUND
None
STATUS
Waiting for fix in a future release of Toad for SQL Server
