If you put blue and purple together, chances are you're going to get a Night fail. Instead, use combos with black and/or diamond hybrids, combos that don't use blue and purple directly, and that will eliminate Night as a possible outcome. Some examples would be: Mercury X Night, Anubis X Night, Black Diamond X Magic, or Black Diamond X Hammerhead. None of those have Night as a possible outcome.
Good luck!