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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 another permanent becomes a copy of a permanent represented by a station card, all of its printed abilities, including the ones represented by station symbols, are copied. Its current characteristics and the number of charge counters on it are not copied. The abilities (and in some cases, types, power, and toughness) are determined based on the number of charge counters on the copy.

The abilities of a permanent with station are based on the number of charge counters it has. This means that if a permanent with station gets charge counters due to some other effect (such as proliferate) or loses charge counters somehow, its abilities change accordingly. The same is true for determining whether or not that permanent is a creature.

Each station card has one or more striations in its text box. Each striation is preceded by a station symbol—a circle surrounding a number and a plus sign.

If a permanent with station becomes a creature, it will be able to attack if it’s been under your control continuously since the turn began. That is, it doesn’t matter how long it’s been a creature, just how long it’s been on the battlefield.

Spacecraft is an artifact type with no special meaning. It doesn’t grant the artifact any intrinsic abilities. Other cards may care about which artifacts are Spacecraft.

If an effect causes a permanent with station to become a creature by some means other than having the appropriate number of charge counters on it, it won’t use any power and toughness values printed in its text box. Instead, it will use whatever base power and toughness was set by the effect that made it a creature.

Use the tapped creature’s power as the station ability resolves to determine how many charge counters to put on the permanent with station. If that creature isn’t on the battlefield at that time, use its power as it last existed on the battlefield.

Each station symbol represents an ability. A station symbol means “As long as this permanent has N or more charge counters on it, it has [abilities],” where N is the number inside the symbol and [abilities] are all the abilities found inside the same striation as that symbol.

If a station card has a power and toughness box printed in one of the striations in its text box, it’s not a creature unless it has the appropriate number of charge counters on it. That card also doesn’t have that power and toughness in any zone other than the battlefield.

Even if a permanent with station has equal or greater charge counters than the number in its last station symbol, you can still activate its station ability. Adding more charge counters won’t give it additional abilities, but other effects or cards might make those extra counters relevant.

A station card is a card with the station keyword ability. The station keyword means “Tap another untapped creature you control: Put a number of charge counters on this permanent equal to the tapped creature’s power. Activate only as a sorcery.”

If the tapped creature has negative power, no charge counters are put onto or removed from the permanent with station.

If that station symbol is in the same striation as a power and toughness box, it instead means “As long as this permanent has N or more charge counters on it, it has [abilities] and is a creature with base power and toughness [P/T] in addition to its other types.”