I CAST....!

I CAST... SUN GO BYE BYE!

I CAST... SUPER NOVA

I CAST…  travel to time to go to a Star Wars planet and get a spaceship to get back to earth.

Why? Earth got swallowed up by the supernova. 

I CAST... teleport to my homebrew DnD world and become a tabaxi.

I CAST... AMPLIFIER. The next spell is amplified by an indeterminate multiplier

With my bonus actions, I CAST... UNDO (Everything is restored to how it was before the spell wars began)

(Due to the effects of Undo, I can cast two more spells immediately)

I CAST... Tooltip. (The next spell casted has a tooltip)

With my bonus action, I CAST... DIMENSION DOOR. The chosen plane is the Far Realm.

I CAST... JUDGE POWERRRRR!

*I am launched in a slingshot towards you, holding a large gavel with which I bonk you. No counterspells allowed!*

Although the supernova does kinda put a wrench in things. With my bonus action, I cast... NEW HOME! I create a new earth for people to live on, with the only difference being that all the land is just a supercontinent in the shape of a gibbering mouther.

Quote from TheMadGibber >>

I CAST... JUDGE POWERRRRR!

*I am launched in a slingshot towards you, holding a large gavel with which I bonk you. No counterspells allowed!*

Although the supernova does kinda put a wrench in things. With my bonus action, I cast... NEW HOME! I create a new earth for people to live on, with the only difference being that all the land is just a supercontinent in the shape of a gibbering mouther.

 Dude, I already reversed the effects of the supernova, which means that now there's Earth and Planet Gibber.

Oh, and also: I CAST... THE WORLD! (Time is paused for 3 actions)

Action 1 - I CAST... Wish, which I use to turn all the land on Planet Gibber into a mass of actual Gibbering Mouther and the water on Plant Gibber into soft flesh with a consistency similar to peanut butter.

Action 2 - I CAST... CRAB RAVE! Every crab in the universe begins dancing and a continuous music plays everywhere where sound can travel.

Action 3 - I CAST... /summon, which I use to summon approximately 5,000 SCP-098 "Surgeon Crab" instances that begin dancing due to the effects of CRAB RAVE.

Time shall move once more.

I use my bonus action. I CAST... NEW PLANET(s)! There are 4 planets, each one with a specific governance.

• Planet 1 - Zombie planet. Every night on this planet, zombies and skeletons of all shapes and sizes climb out if the ground and come from the sea and ghosts appear in the upper atmosphere where they descend to the surface.
• Planet 2 - AI Planet. The planet is entirely covered in a vast network of computing and factory systems as well as spots to launch invasion fleets to it's neighbors. The whole planet is a sentient computer that hates all biological life and tries to turn other constructs to it's side. It is in a never-ending war with Floral Planet and Zombie Planet.
• Planet 3 - Floral Planet. A sentient lotus controls every corner of the planet. Every other lotus that comes from this lotus is a vector for the lotus to spread it's control. It is in a never-ending war with AI Planet and Zombie Planet.
• Planet 4 - Shadowrealm. The entire planet is covered in a sentient darkness that what's to devour the universe. The former 2 acknowledge the threat of this darkness and have formed a temporary truce to stop it.

What if I CAST... THE INFINITE

an endless expanse is formed acting as a bridge between planets

I CAST... ETERNAL LIGHT! (An unbreakable, blinding light lines to path to Shadowrealm to prevent the darkness from escaping).

With my bonus action, I CAST... GRAMMAR!

Quote from bardoffew_alt >>

What if I CAST... THE INFINITE

an endless expanse is formed acting as a bridge between planets

 I CAST… INFINITE MINIGUN!

I CAST LIQUID BONES

Since counterspells aren't allowed, to undo the effects on Planet Gibber I CAST... FLOOD! A tremendously large amount of new water fills up the planet, flooding over the previous water that was turned to flesh.

Knowing that if I put dirt over what used to be the land the gibbering mass would just eat it, as a bonus ACTION I CAST... AWAKEN! The gibbering mass turns into actual gibbering mouthers who worship me as their king. Their 10 feet of swim speed allows them to survive in the boundless ocean while I prepare to make new land.

I cast TREES

Another new planet appears, completely covered with a never-ending forest. The forest is mostly peaceful and is sentient.

I cast... ENJOY SKY BLUE!!!!

Everyone begins to fall infinitely through an endless expanse of blue sky

I CAST DIRT AND WITH MY REACTION I CAST FEATHER FALL

I cast "OH FRICK WHY IS THERE A DRAGON IN THIS MINECRAFT WORLD I THOUGHT YOU SAID IT WAS VANILLA"

I CAST DRAGON NIP

I CAST... DETECT ALIGNMENT. (The dragon's true alignment is revealed to every creature in a 3 km radius.

I CAST SUMMON DRAGON × FIVEHUNDRED