Munitions Expert — ruling 1

The number of Goblins you control is counted only as Munitions Expert’s ability resolves. If Munitions Expert is still on the battlefield, it will count itself.

Munitions Expert : règles, fonctionnement et interactions (MTG)

Munitions Expert 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

Flash When this creature enters, you may have it deal damage to target creature or planeswalker equal to the number of Goblins you control.

How it works : Munitions Expert

Original English text — Wizards of the Coast / Scryfall

#1June 14, 2019· Wizards of the Coast
The number of Goblins you control is counted only as Munitions Expert’s ability resolves. If Munitions Expert is still on the battlefield, it will count itself.
No other card is named in this ruling.