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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.

You don’t own the cards you play this way. An instant or sorcery cast this way will go to its owner’s graveyard. A creature card you cast this way will enter the battlefield under your control, but it will be put into its owner’s graveyard if it dies. The same is true for other permanent cards you cast or lands you play.

You activate X’s first activated ability while X is on the battlefield under your control. This puts X into an opponent’s hand. That opponent plays with their hand revealed, and they’re not allowed to cast X or activate any of X’s abilities—but you are. You can activate X’s second ability to play one of the cards in that hand.

You play the card as X’s last ability resolves, with one exception: You can’t play a land this way unless it’s your turn and you have an available land play. If you’re casting a spell this way, you do so as the ability resolves. Ignore any timing restrictions based on the card’s type. You can cast their sorceries or creatures during their turn, for example.

You choose which card to play as X’s last ability resolves. Your opponent can respond to you activating the ability to get other cards out of their hand. Whatever’s left when the ability resolves is fair game.