Hi all! Long-time player, first-time poster, thanks for all your hard work on this excellent program (those of you who have put in hard work on it, that is)! I believe I've discovered a bug.
I have Kira, Great Glass Spinner on board (stolen by Ashiok's -
X, in case that's relevant), opponent casts
Duplicant and targets Kira with its Imprint ability. Kira's ability triggers to counter
Duplicant's, we let it resolve, and...they both stay on the stack. Phases and the turn end, and both abilities are just hangin' out. See attached screenshot.