440.3. An effect that Creates a Game Object will specify the state and nature of the Game Object created.
440.3.a. If the Game Object is a token, it will follow the normal rules for tokens. See rule 179. Tokens for more information.
440.3.b. If the effect specifies a Game Object is Created for a specific duration, it exists while that duration is ongoing, and ceases to exist once that duration ends.
440.3.c. If a Non-Token Game Object is Created from a finite set of choices made by a Linked Ability during deck building, only one of those Game Objects may exist in play at a time. If a player would Create a Game Object that already exists on the board or on the chain, that action is Negated.