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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 Mizzium Meddler leaves the battlefield before its ability resolves, the targets remain unchanged.

Mizzium Meddler’s triggered ability can target a spell or ability even if Mizzium Meddler wouldn’t be a legal target for that spell or ability. However, the target of that spell or ability will remain unchanged.

If changing one target of a spell or ability to Mizzium Meddler would make other targets of that spell or ability illegal, the targets remain unchanged.

The target of the spell or ability won’t change unless Mizzium Meddler fulfills all the targeting criteria. If a spell or ability has multiple targets, such as Send to Sleep, you can change only one of the targets to Mizzium Meddler.

If Mizzium Meddler’s triggered ability targets a spell or ability with no targets, nothing happens.

If the spell or ability has multiple instances of the word “target,” you choose which target you’re changing to Mizzium Meddler as Mizium Meddler’s ability resolves.

If a spell or ability has a variable number of targets, you can’t change the number of targets.