Floating Mana Tracker in Play tester

The play tester is really good for goldfishing combos. But a lot of combos require keeping track of floating mana to do this. Could there be a drop down bar or something added where you can just +/- from pictures of the mana symbols to help goldfishing combos

If you press M or go to the Player dropdown and select Show Mana Tracker, it will display a mana tracker in the bottom left corner.