Maldad infinita

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

Except for power and toughness, the token copies exactly what was printed on the original creature and nothing else (unless that permanent is copying something else or it is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, and so on.

If the copied creature has {X} in its mana cost, X is considered to be 0.

If the copied creature is a token, the new token that's created copies the original characteristics of that token, with the exceptions noted above.

If the copied creature is copying something else, then the token enters the battlefield as whatever that creature copied, with the exceptions noted above.