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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.

Casting Panglacial Wurm while searching your library follows all the normal rules for casting a creature spell, except for timing (casting the Wurm this way always occurs during the resolution of another spell or ability) and what zone the Wurm is being cast from. The spell goes on the stack. You have to pay the Wurm's mana cost and any applicable additional costs, which means you can activate mana abilities while you're casting the Wurm while you're searching your library.

If you want to cast Panglacial Wurm while searching your library, you must do so before you find any cards with the search effect.

While searching your library, you must keep your library in the same order until you shuffle it.

After you cast Panglacial Wurm, you pick up the search effect where you left off. When the search effect finishes resolving, the active player gets priority with Panglacial Wurm on the stack. Any abilities that triggered when the spell was cast are put on the stack now.

A Panglacial Wurm that you cast while searching your library can't be found by the search effect.

If you have enough mana, you can cast multiple Panglacial Wurms during a single search effect.

Panglacial Wurm's ability works only while you're searching your own library. The effect that caused you to search needs to say "search" and "library," and you need to be looking through your own library for this to work. Examples of effects that let you cast Panglacial Wurm are Rampant Growth and Gifts Ungiven. Examples of effects that don't are Bribery and Sage Owl.