Starkiller bug?
During today's GA I used Starkiller against Tusken Chieftain. Starkiller managed to kill Chieftain with Size Means Nothing and gained another turned, during which this ability could be used again and...
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Neither me nor my opponent used DCs, forgot to mention that :)
In any case, it's a bug. SMN is indeed supposed to be a single use ability, so Starkiller shouldn't be able to do that.