Minas Tirith Garrison — ruling 1

If an attacking Human is tapped for Minas Tirith Garrison's ability (perhaps because it has vigilance or it was untapped after being declared as an attacker), that Human remains an attacking creature.

Minas Tirith Garrison — ruling 2

You choose how many and which creatures to tap while Minas Tirith Garrison's last ability is resolving. No player may take any other actions between the time you make this choice and the time at which you draw cards.

Minas Tirith Garrison — ruling 3

If Minas Tirith Garrison is untapped as its last ability resolves, it can be tapped for its own last ability.

Minas Tirith Garrison : règles, fonctionnement et interactions (MTG)

Minas Tirith Garrison 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

Minas Tirith Garrison's power is equal to the number of cards in your hand. Whenever this creature attacks, you may tap any number of untapped Humans you control. Draw a card for each Human tapped this way.

How it works : Minas Tirith Garrison

Original English text — Wizards of the Coast / Scryfall

#1November 3, 2023· Wizards of the Coast
If an attacking Human is tapped for Minas Tirith Garrison's ability (perhaps because it has vigilance or it was untapped after being declared as an attacker), that Human remains an attacking creature.
No other card is named in this ruling.
#2November 3, 2023· Wizards of the Coast
You choose how many and which creatures to tap while Minas Tirith Garrison's last ability is resolving. No player may take any other actions between the time you make this choice and the time at which you draw cards.
No other card is named in this ruling.
#3November 3, 2023· Wizards of the Coast
If Minas Tirith Garrison is untapped as its last ability resolves, it can be tapped for its own last ability.
No other card is named in this ruling.