Dorcsid (not Discord, mind you!) rose from the remains of Holder's Bolder, his long, slender body weaving through the air.
He squared up to Sweetie Giraffe, who stood immediately opposite him.
"BEHOLD," Dorcsid declared, "I am the taller one! I shall rule Equestria!"
"NO. IS SHORTER. AM TALLER THAN YOU," Sweetie boomed in response. "WIMPY SMOL DRAGON NOT TALL ENOUGH."
She proceeded to grow even taller. Don't mind the balloon-band stretching noises coming from her neck. That's normal.
"I-impossible!" Dorcsid stammered.
"NOT IMPOSSIBLE. AM TALLER NOW. WILL DESTROY ALL SHORTER."
Sweetie Giraffe then destroyed all of reality because she was the tallest of them all.