Promise of Power — ruling 1

The power and toughness of the Demon token are set when Promise of Power resolves. They’re unaffected if the number of cards in your hand changes later.

Promise of Power — ruling 2

If you pay the entwine cost, you draw five cards, then lose five life, then put the Demon token onto the battlefield. The five cards you draw count toward the Demon’s power and toughness.

Promise of Power — ruling 3

The power/toughness of the token is set when this spell resolves.

Promise of Power : règles, fonctionnement et interactions (MTG)

Promise of Power 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

Choose one — • You draw five cards and you lose 5 life. • Create an X/X black Demon creature token with flying, where X is the number of cards in your hand. Entwine (Choose both if you pay the entwine cost.)

How it works : Promise of Power

Original English text — Wizards of the Coast / Scryfall

#1December 1, 2004· Wizards of the Coast
The power and toughness of the Demon token are set when Promise of Power resolves. They’re unaffected if the number of cards in your hand changes later.
Card named in this ruling
Demon
#2December 1, 2004· Wizards of the Coast
If you pay the entwine cost, you draw five cards, then lose five life, then put the Demon token onto the battlefield. The five cards you draw count toward the Demon’s power and toughness.
Card named in this ruling
Demon
#3October 4, 2004· Wizards of the Coast
The power/toughness of the token is set when this spell resolves.
No other card is named in this ruling.