6 words is nothing.
In a short story by Asimov called "Spell my name with an S" a being prevents a world war by changing one letter in one name. (This is done on a bet, and he later decides to triple the odds change another letter and bring back the world war.)
So I say again 6 words is nothing.
This is a "deus ex machina" ability that IMHO should not be reduced to skill levels. It's simply the ability to know everything and predict how every single action no matter how small would effect them. (Super precognition to the n-th degree) a smaller scale of this was displayed in Lucifer season 2 episode 5.
When Uriel makes very small changes like moving a skateboard about an inch and that causes a chain on events that ends with a car crash 5 minutes later.
https://www.youtube.com/watch?v=jwHa6a3dyCQ
Adi