untimely malfunction
When casting Untimely Malfunction using the second mode to target a counter spell with one spell on the stack (which was targeted by the counter spell), I was unable to select a new target for the counter spell, but I was also unable to take any more game actions or undo casting the untimely malfunction which now apparently had no legal targets to finish resolving. It was stuck with "Select 0" grayed out and no possible further actions, so I lost the game on time. An Untimely Malfunction indeed.
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jbrown2002#49856 commented
Had this issue today