The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Can Zuko just as easily petrify legions of enemies, including big monsters, giants etc ?
White Witch is also (to some extent) protected by law of a Supreme Being (Emperor beyond the sea), with a magical law from the dawn of time, which enables her to rightfully claim the life & souls of any evil-doers, and violating that law would cause the end of all of Narnia / all of existence.
White Witch also scales to literal lightning-timer feats in close combat, even without her magic wand she's a very capable fighter.
White Witch is very difficult to scale correctly with the current tiering systems, thanks to her Hax and "protection from a higher being", but potentially Universe- Level already passively, if you deny her right to "claim" the life of a sinner / traitor etc.