The main downside for this card is that any Stifle or fog effects can take this card from a game-winner to a one-sided board wipe against you
The trick to getting the most bang for your buck with Aetherworks Marvel is going for large-scale Energy plays on turns 2 and 3, preferably a two-drop that adds three Energy and following it up with a three that can generate three or four Energy
Urzas Saga can get half of the Cat Oven combo or Shadowspear, Sol Ring or Mana Crypt
The only real difference is in exactly how you do it, and the fact that Gyruda can be your decks companion
So, once you have drawn through your entire deck, Nexus of Fate becomes the perfect extra turn payoff because it shuffles back into your library instead of going to the graveyard
Its an epic scene gorgeously rendered by illustrator Tyler Jacobson, carefully constructed so that adjacent cards can form separate mini-scenes as well as being part of the complete panoramic picture