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Running the latest version, when playing vs AI and the AI plays Kozilek TGD, it can counter any spell without discarding a card, I attach a screenshot when i'm trying to cast kozilek channeler with its cost reduced by 2 via conduit of ruin, and the opponent kozilek ability triggers with X=0.

Its a Commander game, not sure if it happens in other modes (Kozilek is the commander).

The AI can't handle Kozilek at this time, it's been marked as such in the trunk builds.