Armed and Armored — ruling 1

You can cast Armed and Armored even if you don't control any Vehicles or Dwarves. Whatever part of the effect that can happen does, and the rest is ignored.

Armed and Armored — ruling 2

The set of Vehicles affected by Armed and Armored is determined as the spell resolves. Vehicles you begin to control later in the turn won't automatically become creatures.

Armed and Armored : règles, fonctionnement et interactions (MTG)

Armed and Armored 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

Vehicles you control become artifact creatures until end of turn. Choose a Dwarf you control. Attach any number of Equipment you control to it.

How it works : Armed and Armored

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
You can cast Armed and Armored even if you don't control any Vehicles or Dwarves. Whatever part of the effect that can happen does, and the rest is ignored.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
The set of Vehicles affected by Armed and Armored is determined as the spell resolves. Vehicles you begin to control later in the turn won't automatically become creatures.
No other card is named in this ruling.