How to play 3* MF?

I know her C6 is one of the most powerful power amounts all, maybe the most even, but with 3*, I found it is very hard to win, the only thing I can do is chip the Nexus one by one while trying to survive. Like there is no guarantee way to end the fight.

Like to ask some advice about how to play her, recommend relics when not having her C6

Edit*: Thanks for the comments and suggestions, I was focusing on the wrong direction since I thought MF is a champion like to focus on multiple attack with free attacks and scount based on her lvl up requirements , but apparently not.

I will play around the make it rain build that comment recommend, thanks again for the advices!