Activate Rex using Walking Atlas's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

Infinite landfall triggers

Infinite mana lands you control that enter the battlefield untapped can produce

Rex, Cyber-Hound

Trench Behemoth

Walking Atlas

Activate Rex using PuPu UFO's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

PuPu UFO

Activate Rex using Scaled Herbalist's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

Scaled Herbalist

Activate Rex using Budoka Gardener's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

Budoka Gardener // Dokai, Weaver of Life

Activate Rex using Llanowar Scout's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

Llanowar Scout

Activate Rex using Skyshroud Ranger's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

Skyshroud Ranger

Activate Rex using Sakura-Tribe Scout's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

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