"In our hands, the natural world finds more beauty than nature alone could ever provide."

Gilt-Leaf Archdruid

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.

The List

Morningtide

Whenever you play a Druid spell, you may draw a card.
Tap seven untapped Druids you control: Gain control of all lands target player controls.

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.

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.