Valkyrie's Sword
Artifact — Equipment
When this Equipment enters, you may pay 
. If you do, create a 4/4 white Angel Warrior creature token with flying and vigilance, then attach this Equipment to it.
Equipped creature gets +2/+1.
Equip 
Aaron Miller
Kaldheim (KHM)
• #36Rulings
The Angel Warrior creature token enters the battlefield as a 4/4 creature. Any abilities that trigger when a creature with a certain power or toughness enters the battlefield will see the token enter as a 4/4 creature.
(wotc • 2021-02-05)
You decide whether to pay {4}{W} as the enters-the-battlefield ability resolves. If you do, you immediately create the Angel Warrior creature token and attach Valkyrie's Sword to it. No players may respond to your decision to pay or not, and no player may take actions during this process.
(wotc • 2021-02-05)
Rulings
The Angel Warrior creature token enters the battlefield as a 4/4 creature. Any abilities that trigger when a creature with a certain power or toughness enters the battlefield will see the token enter as a 4/4 creature.
(wotc • 2021-02-05)
You decide whether to pay {4}{W} as the enters-the-battlefield ability resolves. If you do, you immediately create the Angel Warrior creature token and attach Valkyrie's Sword to it. No players may respond to your decision to pay or not, and no player may take actions during this process.
(wotc • 2021-02-05)