Seraph is currently a Tier 1 deck. Dragoncraft is the worst class, both in terms of win rates and empirically.
If not, I can tell you how such a deck easily beats Dash, aggro Sword, and Haven. With Necromancy, it depends on what Nefi gives (if it comes) and whether Khavi plays. However, smart players build it slightly differently, which increases the desire to quit the game and do something else.

