Get Out cannot counter Impending
Using a Get Out (counter target Creature or Enchantment) to counter an Overlord of the Mistmoors (Enchantment creature) cast with its Impending cost results in the game asking if the target is valid and then Overlord resolves as if nothing happened.
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sparksfamilyvalues#95319
commented
If the game asked if you were sure about targeting the spell to counter, it's because the spell was uncounterable, most likely due to Cavern of Souls naming Avatar.