As many of you already know, you can earn every power on an idle map exactly twice. This even does not reset after Super Ascension, so think twice before using a power. Especially IM and SL are very valuable powers after Super Ascension...
I just wanted to share a screen on how it looks like (example is from idle map Reconquest 1065):
As you see, the power is not even visible on the map anymore.
Furthermore, the power is also not in the list of "unclaimed powers" under the mines tab.