Nacatl War-Pride — ruling 1

If it's impossible for Nacatl War-Pride to be blocked by exactly one creature, then the defending player may block it with multiple creatures or may leave it unblocked.

Nacatl War-Pride — ruling 2

If Nacatl War-Pride has left the battlefield by the time the triggered ability resolves, the tokens will still enter as copies of Nacatl War-Pride.

Nacatl War-Pride — ruling 3

If Nacatl War-Pride becomes a copy of something else after the ability triggers but before it resolves, the tokens will enter as copies of whatever the ex-Nacatl War-Pride is now. If Nacatl War-Pride became a copy of something else and then left the battlefield, the tokens will enter as copies of whatever it was copying when it last existed on the battlefield.

Nacatl War-Pride — ruling 4

The tokens enter attacking, even if the attack couldn't legally be declared.

Nacatl War-Pride — ruling 5

Putting an attacking creature onto the battlefield doesn't trigger "When this creature attacks" abilities. It also won't check attacking restrictions, costs, or requirements.

Nacatl War-Pride — ruling 6

In a multiplayer game in which you're allowed to attack only one player each combat, the new creatures will be attacking the same player as Nacatl War-Pride. In a multiplayer game in which you may attack multiple players, you choose the player each new creature is attacking. It must be a player you're allowed to attack.

Nacatl War-Pride : règles, fonctionnement et interactions (MTG)

Nacatl War-Pride 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

This creature must be blocked by exactly one creature if able. Whenever this creature attacks, create X tokens that are copies of it and that are tapped and attacking, where X is the number of creatures defending player controls. Exile the tokens at the beginning of the next end step.

How it works : Nacatl War-Pride

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2007· Wizards of the Coast
If it's impossible for Nacatl War-Pride to be blocked by exactly one creature, then the defending player may block it with multiple creatures or may leave it unblocked.
No other card is named in this ruling.
#2May 1, 2007· Wizards of the Coast
If Nacatl War-Pride has left the battlefield by the time the triggered ability resolves, the tokens will still enter as copies of Nacatl War-Pride.
No other card is named in this ruling.
#3May 1, 2007· Wizards of the Coast
If Nacatl War-Pride becomes a copy of something else after the ability triggers but before it resolves, the tokens will enter as copies of whatever the ex-Nacatl War-Pride is now. If Nacatl War-Pride became a copy of something else and then left the battlefield, the tokens will enter as copies of whatever it was copying when it last existed on the battlefield.
Card named in this ruling
Copy
#4May 1, 2007· Wizards of the Coast
The tokens enter attacking, even if the attack couldn't legally be declared.
No other card is named in this ruling.
#5May 1, 2007· Wizards of the Coast
Putting an attacking creature onto the battlefield doesn't trigger "When this creature attacks" abilities. It also won't check attacking restrictions, costs, or requirements.
No other card is named in this ruling.
#6May 1, 2007· Wizards of the Coast
In a multiplayer game in which you're allowed to attack only one player each combat, the new creatures will be attacking the same player as Nacatl War-Pride. In a multiplayer game in which you may attack multiple players, you choose the player each new creature is attacking. It must be a player you're allowed to attack.
No other card is named in this ruling.