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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.

If Kaya’s Ghostform and the enchanted permanent are both put into graveyards and/or exiled at the same time, the enchanted permanent will be returned to the battlefield.

If the enchanted permanent is put into a graveyard or exile but leaves that zone before the last ability of Kaya’s Ghostform resolves, that card stays in its new zone, even if that zone is also a graveyard or exile. You don’t return it to the battlefield.

If another player gains control of the enchanted permanent, Kaya’s Ghostform will be put into your graveyard.

If an effect exiles the enchanted permanent and immediately returns it to the battlefield, the last ability of Kaya’s Ghostform triggers but will have no effect. If an effect exiles the enchanted permanent and would return it to the battlefield at a later time, Kaya’s Ghostform will return that card to the battlefield and it won’t be returned later.

If Kaya’s Ghostform enchants a permanent you control but don’t own, that permanent will return to the battlefield under your control when it dies or is exiled. In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any creatures you control from Kaya’s Ghostform’s effect are exiled.

Kaya’s Ghostform is put into your graveyard once the enchanted permanent leaves the battlefield. It doesn’t return to the battlefield with that permanent.

Kaya’s Ghostform can enchant a token, but its last ability won’t return the token to the battlefield.