You buffed it to compensate for the Pyro nerf and than took out the pyro nerf and never "fixed" this. I say fixed because this spell before was really the only difference between a godmode damage mage and an average raid damage mage and now it's impossible as long as you have a pot rolling to get anything lower than 50k a tick if you try.
For those of you who don't exactly know how to get this (even though mage is incredibly easy)
Prepot start fight
In my case wait for both trinkets to proc as well as a free pyro
Hit PoM/Alter Time
Pyro Pyro / Alter Time Pyro Pyro
Where you combust is dependent on if your first pyro crit or not if it did cmobust after the third pyro, if it didn't combust after the fourth unless you wanna roll the dice and hope the last 3 do.