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Zombies is just a deck with creatures. It's good but beatable.
Marvel is something else. It's powerful, but as we learned in the Emrakul, the Promised End era, it can be extremely flexible. For the near future you have two options: play it or beat it.
For reference, here are the three current varieties.
First is what I consider to be the best creature heavy build in Martin Mueller's Top 8 list featuring Servant of the Conduit and Chandra, Flamecaller. This is the list I would tell everyone to start testing against.