This sure looks like a forager board to me. I'm not convinced that marauder is essential here though, at least for opening. Your opponent erred by getting treasures too early and not trashing enough. I would open double forager like he did and then with the shuffles he got on turns 3 and 4 I would get loan and marauder. Afterwards I would get a third forager and then start getting and trashing treasures. I'm not sure what role procession, sage, and vault play here.