Cosmos is unimpressed. And probably thinks she should stop phrasing her intentions like that.
 
The filly might have thought her villainous aspirations made her worthy of becoming something greater. The only thing cosmos saw was a little selfish brat with fantasies of grandiure.
 
Selfish ambitions - yes. But hardly worthy to be considered one of the greatest villains in Equestria.
 
Why Grogar had even bothered bringing a child into his legion was beyond Cosmos.
 
Desperate times must have called for desperate measures indeed.
 
But not something worthy to become one with this goddess.
 
Cosmos flinged the filly away in the most cassual of ways.
 
The filly did not just entered terminal velocity, it slammed straight through it. It was flung with such force that it broke not only the sound barrier, but the very speed of light. And wich such speeds, the filly was exposed to all the friction and the G force of the material realm. All the barriers that would normally prevent such feats colided head first with the filly, as it imidiatly combusted as it scraped against the G force of unimaginable power. But even there it did not stop. Such greats speeds did the filly enter, that every molecule of its being surpassed the speed force, and slamed through the barriers of quantrum physiks, and every molecule was bombarded with the full force of the universe. Causing such damage to the molecules that they were broken down into their mose based energies. And still these energies surpassed the speed of light and slammed even further into the realm of the timestream. The forces of the univese rebelled against this pervertion of the naturnal principles. As every objeckt is meant to exist at a ceritan point in time, the filly stretched its place in existense and timespace like a rubber band. And the further it was stretched. The further it was removed from its place in timespace. Its history and future being pulled out along with it. Untill the rubber band snapped. The fabrick of timespace reparing the damage the filly caused to it by erasing it from history. Its very existance erased by the speeds which it had entered.
 
 
Note: Yes. That was an overly long and rambly way to say that Cozy was flinged so hard she ceased to exist.
 
 
Note 2: I do not hate Cozy glow, I actually liked the purpose she served as a villain in the second to last season.
 
The joke is simply that after absorbing all the villains in the world Cosmos would not think Cozy glow worth it.