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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.

When you cast a sorcery spell, Spellweaver Volute's ability triggers. It will make a copy of the enchanted card. The copy will exist in the graveyard. You'll have the option to cast the copy. If you don't, the copy remains in the graveyard and ceases to exist the next time state-based actions are checked. If you do cast the copy, the copy is cast from the graveyard. After you finish casting it, the enchanted card is exiled and you must choose a new instant card in a graveyard to attach Spellweaver Volute to. If you can't, Spellweaver Volute remains on the battlefield attached to nothing and is then put into the graveyard the next time state-based actions are checked.

Say Spellweaver Volute's ability triggers, then Spellweaver Volute leaves the battlefield in response. Then the instant card that was enchanted is removed from the graveyard in response. When the Volute's ability resolves, it will check its last existence on the battlefield and identify the "enchanted card" as that instant card, so the card is copied and controller of the triggered ability may cast it.

The Aura will be on the battlefield attached to a card in a different zone. The Aura won't be in the graveyard. The enchanted card won't be on the battlefield.

Say Spellweaver Volute's ability triggers, then the enchanted instant card is exiled in response. Spellweaver Volute, which is now enchanting nothing, is put into its owner's graveyard as a state-based action. When the Volute's ability resolves, it will check its last existence on the battlefield and identify the "enchanted card" as "nothing," so no copy is created.

This Aura targets, and enchants, an instant card in a graveyard. This is the first Aura that enchants something that's neither a permanent nor a player.

If the enchanted card changes zones (due to being cast with flashback, or being exiled with Cremate, for example), Spellweaver Volute "falls off" and is put into its owner's graveyard as a state-based action.