A basic Hearthstone Deck Tracker plugin that displays a list of all currently unique casted spell schools. Works with all current cards (as of Hearthstone Patch 27.2).
https://github.com/HearthSim/Hearthstone-Deck-Tracker/wiki/Creating-Plugins - Basic Tutorial
https://github.com/slicedbread/HDT-SpellSchoolCounter-Plugin - Old Spell School Plugin