Pugnacious Hammerskull — ruling 1

If you didn't control another Dinosaur when you declared Pugnacious Hammerskull as an attacker, it doesn't matter whether or not you control one as its ability resolves. You'll still put a stun counter on Pugnacious Hammerskull.

Pugnacious Hammerskull : règles, fonctionnement et interactions (MTG)

Pugnacious Hammerskull 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 while you don't control another Dinosaur, put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

How it works : Pugnacious Hammerskull

Original English text — Wizards of the Coast / Scryfall

#1November 10, 2023· Wizards of the Coast
If you didn't control another Dinosaur when you declared Pugnacious Hammerskull as an attacker, it doesn't matter whether or not you control one as its ability resolves. You'll still put a stun counter on Pugnacious Hammerskull.
No other card is named in this ruling.