And Door Twilight a Up

She needs some wings.

Sombra castle stairs climbing excessive.
 
Give Twilight a few weeks and she will be as athletic as Applejack.

@ClownDicks
 
I told you man. I told you about stairs.

@FeatherFoot  
slowly escalating piano playing in background

Sombra meets M. C. Escher.

@EvilTon
 
The Mario 64 gives the illusion that Twilight goes faster and faster!

@EvilTon  
Either way, it seems legit.

This is remarkably fluid animation. You can even see Twilight dragging her hindlegs a little, showing how tired she’s becoming by climbing all those steps.

Appropriate soundtrack
 
Or alternatively

Climbing stairs is actually pretty good physical exercise.

“Oh my god so many stairs.  
I’d like to find whoever invented the stairs, and push him down these stairs, just to show him how stupid stairs are.  
Then his legs will be broken and he will no longer be able to climb the stairs anymore.  
It will be ironic, and then his wife will leave him to be with the man who invented the elevator, because everyone knows that elevators are much sexier than stairs, and oh my god I’m not even close to being to the top yet.  
Why are there so many stairs?!”