Kessig Cagebreakers — ruling 1

You count the number of creature cards in your graveyard when the triggered ability resolves.

Kessig Cagebreakers — ruling 2

You declare which player or planeswalker each token is attacking as you put it onto the battlefield. It doesn't have to be the same player or planeswalker Kessig Cagebreakers is attacking.

Kessig Cagebreakers — ruling 3

Although the tokens are attacking, they were never declared as attacking creatures (for purposes of abilities that trigger whenever a creature attacks, for example).

Kessig Cagebreakers : règles, fonctionnement et interactions (MTG)

Kessig Cagebreakers 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

Whenever this creature attacks, create a 2/2 green Wolf creature token that's tapped and attacking for each creature card in your graveyard.

How it works : Kessig Cagebreakers

Original English text — Wizards of the Coast / Scryfall

#1September 22, 2011· Wizards of the Coast
You count the number of creature cards in your graveyard when the triggered ability resolves.
No other card is named in this ruling.
#2September 22, 2011· Wizards of the Coast
You declare which player or planeswalker each token is attacking as you put it onto the battlefield. It doesn't have to be the same player or planeswalker Kessig Cagebreakers is attacking.
No other card is named in this ruling.
#3September 22, 2011· Wizards of the Coast
Although the tokens are attacking, they were never declared as attacking creatures (for purposes of abilities that trigger whenever a creature attacks, for example).
No other card is named in this ruling.