You can't go that far. Roll death saves!

uh... I originally did actually roll... but I realised that reloading changed the numbers.

SUCCESS! As I rise from my death, the surrounding people look confused. Then, a nothic disguised as a Hobbit approaches. "This isn't an actual game!" He says. But then I say "**** you I make my own rules!"

I Cast... Inspiration.

You inpsire the enemy to have a second-wind in the fight. Your companions are very "thankful."

I cast Goodberry

Your spell just prevents the braincells of the target to communicate between themselves, provoking on that target a mental disease, that last no longer than 1 month.

I cast Faerie Fire.

Instead of lighting up an enemy, arson-minded fairies come to the scene and now instead of saving the town from an ogre you're desperately trying to get the remaining villagers away from the blazing firestorm that emerged.

I cast Pass Without Trace

You accidentally cast Pass Without Tracy. And all of your party members happen to be named Tracy. So as you sneak around, they disapear with a poof one by one, leaving you alone in the middle of the enmy encampment when the spell ends.

I cast crown of stars. 

He stooped and looked in Mirrormere
And saw a crown of stars appear
As gems upon a silver thread
Above the shadows of his head

The world was fair
The mountains tall
In elder days before the fall
Of mighty kings in Nargothrond
And Gondolin who now beyond
The Western seas have passed away
The world was fair in Durin's day

Song Link

Casting the spell now requires you to sing the Song of Durin every time you do something and you can only play dwarves.

I cast Fireball

Here's an oldie.

It seemed like a good idea at first. After all, you're a wizard. You cast Fireball. That's what you do.

But something terrible happened. You became addicted to Fireball. It just gave you such a feeling of power, dealing 8d6 damage in a 20-foot-radius sphere, with merely a 3rd level spell slot. You kept coming back to it. You couldn't escape. Now, your wizard walks the world as the lowest form of wizard, addicted to using all spell slots of 3rd to 5th level to cast a single spell. You have been left as essentially a sorcerer without the metamagic options and other cool stuff that makes a sorcerer a sorcerer, left with so many spell slots and yet just... one... spell...

Anyways... you pick a spell. My character is too scared of your double-addiction to cast anything.

Ok. 

You cast true strike. It is boring. 

I cast druid grove. 

I won't say what happens, this is PG.

I cast Invisibility of the 4th level as my last spell slot. I then invade Cleripure with the intentions of removing their TM.

The guard at the door has the blind fighting style and makes an attack of opportunity with Sentinel as you enter the reach of his halberd, stopping you dead in your tracks.

I cast plant growth and expect my apples and vegetables to be ready for harvest soon.

Unbeknownst to you, there were a number of Blights in the area, who used the powers you gave them to eat you (and also your apples and vegetables)

I cast true strike!

Random crits. Basically, if you didn't cast True Strike, you would've double-critical'd.

I cast Disguise Self

You are a very terrible spellcaster, though, and find out that you can only change the appearance of your left pinky toe. 

I cast the spell of all spells: WISH. 

You do not speak it clearly enough, it sounds more like "fish". And that is what happens -  it starts raining fish, tons of fish.

I cast vicious mockery.

The spell fails because your flambouyance and etiquette skills you've earned, by being born in a Castle, dosen't allows you to either know nore either tell an easy mock.

I cast Swift Quiver

The quiver seems to have created the wrong ammunition, a supply of paper mache arrows.

I cast  Antimagic Field.

It works. The BBEG is 2 feet away.

 I cast Disguise Self as the BBEG, and use a knife to backstab him.

The anti-magic field is still in effect. Your casting doesn't work.

I cast Sleep