I understand that having curses in the game is a fun counter to the buffs we can have.

But whoever thought about halving energy regen should probably think it over again.

I suggest the following change: Instead of halving energy regen, half the energy cap.
So, 50 for regular players, 100 for donators.

This way it doesn't severely impact regular gameplay, and you can still perform a normal amount of revives / attacks a day.