What are the limits in terms of spells? How many you can cast, how strong they can be, what they can do, what you need to cast them, that kind of stuff
It's kind of up to the limitations you've set for your character but I'd say nothing too extreme in terms of power levels... for example controlling and manipulating the elements to a reasonable degree is completely fine but something like turning an entire forest into ice cream with the snap of one's fingers would be a bit too much. Also things that have very large-scale implications, like turning back time, cross-dimensional travel, universal alterations to space time, etc, would generally be considered outside the practical scope of possibility. If things get into a gray area I might just roll a dice to determine whether it works or not. I'm mostly lenient about everything though so feel free to be creative and have fun with things! And as always feel free to ask about anything you're not sure about.