Phoebe, Head of S.N.E.A.K. — ruling 1

If Phoebe steals a creature's text box, that creature no longer has that text box. Phoebe now has her own text box in addition to the one she stole.

Phoebe, Head of S.N.E.A.K. — ruling 2

If anything cares about Phoebe's rules text, flavor text, or watermarks, consider all of her text boxes as if they were one. If anything cares about the rules text, flavor text, or watermarks of a creature whose text box was stolen, the effect sees nothing.

Phoebe, Head of S.N.E.A.K. — ruling 3

If Phoebe steals a creature's text box, that creature will no longer have flavor text and can then block Phoebe.

Phoebe, Head of S.N.E.A.K. — ruling 4

If Phoebe has abilities that contradict one another, the most recently added one wins. For example, if Phoebe has the text boxes of both Beast of Burden (power and toughness equal to the number of creatures on the battlefield) and Psychosis Crawler (power and toughness equal to the number of cards in your hand). Phoebe's power and toughness would be defined by the text box added most recently.

Phoebe, Head of S.N.E.A.K. — ruling 5

If Phoebe leaves the battlefield, the stolen text boxes are lost. She doesn't keep them, and she certainly doesn't give them back to their original owners.

Phoebe, Head of S.N.E.A.K. — ruling 6

If a creature loses its text box, leaves the battlefield, and then returns to the battlefield, it will once again have its text box. This won't affect Phoebe, who presumably still has the one she stole from the original creature.

Phoebe, Head of S.N.E.A.K. — ruling 7

A creature without a text box can later gain abilities. Those abilities will work.

Phoebe, Head of S.N.E.A.K. : règles, fonctionnement et interactions (MTG)

Phoebe, Head of S.N.E.A.K. 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

Phoebe can't be blocked by creatures with flavor text. : Phoebe permanently steals target creature's text box. (That creature loses all rules text, flavor text, and watermarks. This creature gains them.)

How it works : Phoebe, Head of S.N.E.A.K.

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
If Phoebe steals a creature's text box, that creature no longer has that text box. Phoebe now has her own text box in addition to the one she stole.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
If anything cares about Phoebe's rules text, flavor text, or watermarks, consider all of her text boxes as if they were one. If anything cares about the rules text, flavor text, or watermarks of a creature whose text box was stolen, the effect sees nothing.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
If Phoebe steals a creature's text box, that creature will no longer have flavor text and can then block Phoebe.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
If Phoebe has abilities that contradict one another, the most recently added one wins. For example, if Phoebe has the text boxes of both Beast of Burden (power and toughness equal to the number of creatures on the battlefield) and Psychosis Crawler (power and toughness equal to the number of cards in your hand). Phoebe's power and toughness would be defined by the text box added most recently.
No other card is named in this ruling.
#5January 19, 2018· Wizards of the Coast
If Phoebe leaves the battlefield, the stolen text boxes are lost. She doesn't keep them, and she certainly doesn't give them back to their original owners.
No other card is named in this ruling.
#6January 19, 2018· Wizards of the Coast
If a creature loses its text box, leaves the battlefield, and then returns to the battlefield, it will once again have its text box. This won't affect Phoebe, who presumably still has the one she stole from the original creature.
No other card is named in this ruling.
#7January 19, 2018· Wizards of the Coast
A creature without a text box can later gain abilities. Those abilities will work.
No other card is named in this ruling.