The clone effect always specifies when it makes a token
It doesn't copy whether that artifact is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on
There are probably a lot of ways people are going to think of to use this energy, however many powerful attackers need two energies to get their attack off, meaning this card is likely to be a powerful addition to many decks
Its promise
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The initial 3 mana can dampen how much you can play, but if you can get a card like Gray Merchant of Asphodel back, its totally worth it