Mage Rotation Helper

Tells you what to cast as an Arcane Mage. The whole spec runs on the Arcane Blast stack tracker - every Blast makes the next one hit harder and cost more for 8 seconds - so this watches your live stack count and tells you when to keep stacking and when to fill with Frostbolt (or Fireball) so the stacks drop off and your next Blast starts cheap again. Three pips under the icon show where you are in the cycle, and the border changes colour while Arcane Power is driving. Just an icon overlay plus an optional glow on your action bar, nothing gets cast for you.

Commands: /mgh opens the settings panel, where you can pick your filler, set how many stacks to build, or run the built-in test scenarios.

Checked the priority against Wowhead, Icy Veins, and Warcraft Tavern before publishing this. It reads your live stacks rather than counting casts, so the pattern still holds at high haste when more fillers fit in the window.