Watching a rerun of Bewicthed on TV Land got me musing on the way witchcraft seems to work in their world…
There are different power levels of witchcraft. Samantha is powerful, but Endora and Maurice are more powerful by at least an order of magnitude.
No witch can undo the effect of another witch’s spell, no matter how powerful the witch.
A witch’s power is inherited, not acquired. A mortal cannot become a witch through his own devices, although a witch can infuse him with magic at least temporarily.
Simple magic (levitation, teleportation, materilization of common objects) can be triggered by body gestures - hand waving, nose twitching, etc. More complex magic (time travel, materilization of complex objects) requires that a spell be uttered.
Any other observations?