Panglacial Wurm — ruling 1

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.

Panglacial Wurm — ruling 2

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.

Panglacial Wurm — ruling 3

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.

Panglacial Wurm — ruling 4

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

Panglacial Wurm — ruling 5

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

Panglacial Wurm — ruling 6

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

Panglacial Wurm — ruling 7

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

Panglacial Wurm : règles, fonctionnement et interactions (MTG)

Panglacial Wurm is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Trample While you're searching your library, you may cast this card from your library.

How it works : Panglacial Wurm

Original English text — Wizards of the Coast / Scryfall

#1July 15, 2006· Wizards of the Coast
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.
No other card is named in this ruling.
#2July 15, 2006· Wizards of the Coast
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.
No other card is named in this ruling.
#3July 15, 2006· Wizards of the Coast
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.
No other card is named in this ruling.
#4July 15, 2006· Wizards of the Coast
If you have enough mana, you can cast multiple Panglacial Wurms during a single search effect.
No other card is named in this ruling.
#5July 15, 2006· Wizards of the Coast
A Panglacial Wurm that you cast while searching your library can't be found by the search effect.
No other card is named in this ruling.
#6July 15, 2006· Wizards of the Coast
If you want to cast Panglacial Wurm while searching your library, you must do so before you find any cards with the search effect.
No other card is named in this ruling.
#7July 15, 2006· Wizards of the Coast
While searching your library, you must keep your library in the same order until you shuffle it.
No other card is named in this ruling.