Kroble appears to be bugged in quick draft. My opponent attacked and put the trigger on the stack. In response I killed the attacking creature. My opponent still surveiled (which may be correct - tried to check the rules but rules don't appear to be posted anymore), but they also surveiled equal to the new counters instead of what the creature had on it when they died. Since the counter was not placed on the creature this is definitely wrong and it should use the last information available.