Set 7 straight Mag ride line

I know it might seem like Biara will hurt your attacks late game, but she fills two holes this deck greatly needed filled in just one card. And you can use her as early as turn 1. When you ride Elder anyway, you can just call whatever you put in. This deck only has 3 cards that CB, so we aren't in need of a CC, but we always need SC for the Prison matchup. Enpix is also here, again, for the Prison matchup. I don't recommend not running two of him at this point. You could bump him up to 3 if you want, but he only protects rear-guards, and he's already competing for space with 10 other cards in the deck (Biara and the other back row skills). Thanks to Elder's effect, the deck isn't punished for running max of the g3 vanguard, even though it does become a vanilla attacker while it's on the field. Serrol does have a pretty high chance to whiff, even with 7 Magnolias in the main deck, so use him carefully and only as needed.

You might decide to take out some power cards, which there are quite a few of, in favor of more card economy, and that's fine. I still need to test this deck myself to find all its weaknesses, so it's just an idea I wanted to share at this point. Happy fighting!