Mages in teamfights

Hi Guys, I am a Platinum ADC player who wants to pickup mid. Im looking towards picking up mages such as orianna. I usually win my lane but throw in teamfights. How do I play teamfights as a mage? Should I just stay back in hit whatever is possible just like an adc or should I play more forward trying to hit their backline with my ulti? Thanks for any help!
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