If the copied artifact has in its mana cost, X is 0.

If X is 5 or more and any of the target artifacts become illegal, you create a token only for each of the artifacts that is still a legal target.

If the copied artifact is copying something else, then the token enters the battlefield as whatever that artifact copied.

If the copied artifact is a token, the token that's created copies the original characteristics of that token as stated by the effect that created the token.

Each token copies exactly what was printed on the original artifact and nothing else (unless that artifact is copying something else or is a token; see below). 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.

Any enters-the-battlefield abilities of the copied artifact will trigger when the token enters the battlefield. Any "as [this artifact] enters the battlefield" or "[this artifact] enters the battlefield with" abilities of the artifact will also work.

Each token gains haste after it has been created. If something copies one of these tokens, the copy won't have haste, and you won't exile it at the beginning of the next end step.