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If an ability would produce one or more mana of an undefined type, it produces no mana instead.

Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.

To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”

An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.

The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

Splinter Twin grants an activated ability to the enchanted creature. That creature's controller (who is not necessarily the Aura's controller) can activate it. The creature's controller is the player who gets the token.

The token will not be kicked, even if the creature it's copying was.

If the enchanted creature is copying something else when the ability resolves (for example, if it's a Renegade Doppelganger), then the token enters as a copy of whatever the enchanted creature is copying, plus it has haste.

If the token isn't exiled when the delayed triggered ability resolves (due to Stifle, perhaps), it remains on the battlefield indefinitely. It continues to have haste.

If the enchanted creature has {X} in its mana cost (such as Protean Hydra), X is considered to be zero.

The token is exiled at the beginning of the next end step regardless of who controls it at that time, or whether Splinter Twin or the enchanted creature is still on the battlefield at that time.

If the enchanted creature is a token, the new token copies the characteristics of the original token as stated by the effect that put it onto the battlefield, plus it has haste.

Any "enters" abilities of the enchanted creature will trigger when the token is put onto the battlefield. Any "as [this creature] enters" or "[this creature] enters with" abilities of the enchanted creature will also work.

If you activate the ability and the enchanted creature leaves the battlefield before the ability resolves, you still get a token. The enchanted creature's last existence on the battlefield is checked to see what it was (specifically, if it was itself or if it was copying something else).

If the ability is activated during a turn's end step, the token will be exiled at the beginning of the following turn's end step.

The token that's put onto the battlefield copies exactly what's printed on the enchanted creature (unless that creature is copying something else or it's a token; see below), plus it has haste. It doesn't copy whether the enchanted creature is tapped or untapped, whether it has any counters on it or Auras attached to it, or whether it's been affected by any noncopy effects that changed its power, toughness, types, color, or so on. In particular, it doesn't copy the ability granted to the enchanted creature by Splinter Twin.

If the enchanted creature is legendary, you will have to put either the original creature or the token into the graveyard as a state-based action.