I would wreak some excellent chaos, what else?

Whatever the confines of my twisted little imagination can come up with. The sky’s the limit.

Alright, first order of business.The moon and all moon rocks are now made of cheese. Clouds are now pillows and they rain root beer. Snow is now vanilla ice creme and hail is now chocolate chunks, making sleet root beer floats. Cars now behave as they would in gta 4 ‘Carmageddon’ and buildings bounce up and down like in 50’s cartoons or the 90’s ending of sesame street.  
That all i got right now. Oh! and all ‘animals’ move in slo-mo (-2.5x speed) even in mid-air.

Kill celestia in her sleep, corrupt Luna into Nightmare Moon, Nuke Ponyvill and then take over the world.

I’m discord?
 
save the freaking universe from normal people!

Freak out over the possibility that Discord may be my future self, come up with an elaborate plan to avoid being turned to stone if that turns out to be the case (and a backup plan, and a backup backup plan), then try to outdo Cyriak.

Go into every single franchise that I feel is in the gutter (Kingdom Hearts) or ended badly (such as Hellsing) and proceed to make a few….“modefications”…..laughing evily as I do so…

Torment those who think people need to conform to stereotypes.
 
:D

Form an alliance with Queen Chrysalis.  
She gets the ponies, and I wreak chaos across Equestria.  
I’ll take care of Shining Armor and Princess Cadence whilst she deals with the Elements of Harmony. After that, Luna and Celestia will have no choice but do deal with us directly, and presumably fail.

@TheAussieBlue
 
Wow.
 
That is pure evil.

Find hated enemy. Replace eyes with continuously pooping anuses. Rinse wash repeat.

Cast spell on everypony:
 
Frenzy on 1000 Levels for (infinity)  
Restore Health 1000 for (infinity)
 
Then play “Everyone has Aids” in the background

something along the lines of flesh growing on walls demons that feed on the souls of the weak raining blood and a static sky
 
or a tripy candy land world

Make dinosaurs alive again.  
Also, make MLP ponies exist but their personalities are different than what bronies would expect.  
Total Chaos.

Take sweet, sweet vengeance on the people I loathe (no pain, just the humiliation they deserve) and shower my friends and the nice people I know with gifts.  
Basically, I’d be a more selfish Santa.

I would first give myself all of Discord’s powers to be retained in the event that I resume my human form. For kicks, I would also allow myself to physically transform between my human form and Discord at will.
 
Just covering the bases there. If I get Discord’s power, there’s no way I’d want to lose it.
 
After that, I’d bring back Dinosaurs.
 
Beyond that, who knows.

Construct a chorus of nothing but nails on a blackboard.  
Replace all music with it.

@Radiant Heart
 
Am I a worthy human?

Destroy humanity as we know it. By transforming worthy humans into ponies and sending them to Equestria (transform Earth into Equestria as an option), and sending everyone else into a dimension of fire, brimstone and eternal agony (would make one if none exists).

You don’t think it’s serious if the Eternal Champion has the Black Sword? That’s scary stuff!