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If the first spell you cast with Kalecgos gets counterspelled you can cast a second cast for free
I don't know if that's intended but it was a neat interaction I encountered, since I got to trigger the secret without spending mana on it. Probably won me the game.
Josh Durica
This is a bug. Kalecgos' effect should be consumed by a spell that gets countered. The fix should go out with the next patch.