To be honest, I have no idea what most of the icons are meant to represent (aside from the 4 elements, since they were tutorialized), so after a long period of random guessing I gave up on figuring out how to make lightning.
Viewing post in The Wizard's Apprentice jam comments
The lightning is pretty close to the end of the rule set we came up with, so it sounds like you experienced most of the game. Trying to discover which elements do what was intended to be part of the experience, but we could have done a better job making it less confusing by making a better tutorial. Thank you for trying it out!