League of Math
Your attack deals magic damage. But, you also have to factor in the enemy magic resistance. Alright. But oh no, your attack also manages to do percentage per max health damage as well. Okay. But the damage isn't burst, but rather damage over time that deals it in waves every .5 seconds for four seconds. O...okay. A yeah and there is also a slow that slows for a percentage but the enemy has Mercury Treads, so make sure to calculate for that too. OH GOD STOOOP! Oh it crits too also, yes. But you also have Infinity Edge, so it deals 250% instead of just 200. So do the math for that too.
I hated math in high school, I was good at it but I hated it. Who likes math? Nobody likes math. Nobody's favorite subject is ever math. I remember back in the day when everything was just flat damage and stuns or something like that. Now I have to bring a god damn calculator with me in order to properly calculate whether my full combo will actually end in an enemy death or me face down in the earth like the dog that I am.
EDIT: Alright then, putting this here so people aren't confused. This is satirical. I don't actually bring a calculator with me to the Rift because that would be completely ridiculous. Apparently some think otherwise.