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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 the exiled card’s owner casts it, the spell has no relation to the spell that player originally cast. Any choices made for the original spell or effects affecting the original spell aren’t carried over to the new one.

If the player casts the exiled card, they do so as part of the resolution of Spell Queller’s last ability. The player can’t wait to cast it later in the turn. Timing permissions based on the card’s type are ignored, but other restrictions (such as “Cast [this card] only during combat”) are not.

For spells with {X} in their mana costs, use the value chosen for X to determine if the spell’s mana value is 4 or less.

Spells that can’t be countered can be exiled by Spell Queller’s ability. They won’t resolve.

If Spell Queller leaves the battlefield before its “enters” ability resolves, its leaves-the-battlefield triggered ability triggers, resolves, and does nothing. Then its first triggered ability resolves and exiles the spell forever.

If a player casts a card “without paying its mana cost,” they can’t choose to cast it for any alternative costs, such as emerge costs. The player can, however, pay additional costs, such as escalate costs. If the card has any mandatory additional costs, those must be paid to cast the card.

If the card has {X} in its mana cost, the player must choose 0 as the value of X when casting it without paying its mana cost.