Cackling Counterpart

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

Any “enters” triggered ability of the copied creature will trigger when the token enters the battlefield. Any “as [this creature] enters” or “[this creature] enters with” abilities of the chosen creature will also work.

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

The token copies exactly what was printed on the original creature and nothing else (unless that creature is copying something else or 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, or any non-copy effects that have changed its power, toughness, types, color, or so on.

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

"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."