grenzo, crooked jailer
I countered Grenzo with Spell Swindle, but a pop-up appeared asking if I was sure, as if Grenzo were uncounterable. I got my treasures, but Grenzo still hit the field.
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Rezzahan#77802
commented
Then it was uncounterable. An uncountarable spell kis still a legal target for a counterspell. The spell won't get countered, but additional effects of the counterspell still happen.
Probably was cast with mana from the Cavern of Souls land, set to Goblin or Rogue.