Ever since I updated spells dont work on people in creative mode.

From the changelog in 7.9.4:

 - Spells will only target survival and adventure mode players. This can be controlled with the target_game_modes parameter.

This plugin does not support creative mode.

If you want to change this behavior, put this in plugins/Magic/spells.yml

default:
  parameters:
    target_game_modes: creative,survival,adventure

I must've missed that changelog, thanks!