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Whenever another nontoken creature enters the battlefield, you may pay {1}{G}. If you do, that creature's controller creates a token that's a copy of that creature.
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 copied creature will also work.
If the copied creature has {X} in its mana cost, X is 0.
If the copied creature is copying something else, the token enters the battlefield as whatever that creature is copying.
If the entering creature leaves the battlefield before Bramble Sovereign's ability resolves, use that creature's last known existence on the battlefield to determine the token's characteristics.
The token copies exactly what is printed on the creature and nothing else (unless that creature is copying something else; see below). It doesn'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.
While resolving the triggered ability of Bramble Sovereign, you can't pay {1}{G} multiple times to have a player create more tokens.
