Gilt-Leaf Archdruid — ruling 1

Since the activated ability doesn’t have a tap symbol in its cost, you can tap creatures (including Gilt-Leaf Archdruid itself) that haven’t been under your control since your most recent turn began to pay the cost.

Gilt-Leaf Archdruid — ruling 2

The second ability’s effect has no duration. You retain control of those lands until the game ends or until some other effect causes them to change control.

Gilt-Leaf Archdruid : règles, fonctionnement et interactions (MTG)

Gilt-Leaf Archdruid 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 you cast a Druid spell, you may draw a card. Tap seven untapped Druids you control: Gain control of all lands target player controls.

How it works : Gilt-Leaf Archdruid

Original English text — Wizards of the Coast / Scryfall

#1April 1, 2008· Wizards of the Coast
Since the activated ability doesn’t have a tap symbol in its cost, you can tap creatures (including Gilt-Leaf Archdruid itself) that haven’t been under your control since your most recent turn began to pay the cost.
No other card is named in this ruling.
#2April 1, 2008· Wizards of the Coast
The second ability’s effect has no duration. You retain control of those lands until the game ends or until some other effect causes them to change control.
No other card is named in this ruling.