The rules of this game are...
You first state who'd win the death battle mentioned by the user above you.
Than you come up with a new death battle.
As long as you choose a canon pony, you shouldn't need to explain them.
However, if you choose to have an OC in a death battle, make sure to describe the OC's stats.
I hope you guys have fun with this.
First Death Battle
Queen Chrysalis VS King Sombra