While resolving the triggered ability of Bramble Sovereign, you canâ€™t pay multiple times to have a player create more tokens.
The token copies exactly what is printed on the creature and nothing else (unless that creature is copying something else; see below). It doesnâ€™t copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.
If the entering creature leaves the battlefield before Bramble Sovereignâ€™s ability resolves, use that creatureâ€™s last known existence on the battlefield to determine the tokenâ€™s characteristics.
If the copied creature is copying something else, the token enters the battlefield as whatever that creature is copying.
If the copied creature has in its mana cost, X is 0.
Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any â€œAs [this creature] enters the battlefieldâ€ or â€œ[This creature] enters the battlefield withâ€ abilities of the copied creature will also work.