Activate Zuran Orb by sacrificing a land.
Play the land from your graveyard.
Repeat.

Infinite lifegain triggers

Infinite lifegain

Infinite landfall triggers

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

Fastbond

Zuran Orb

Walk-In Closet // Forgotten Cellar

Activate Trench Behemoth by returning Seraph Sanctuary from the battlefield to your hand, untapping it.
Play Seraph Sanctuary, triggering its first ability and Fastbond.
Resolve the Seraph Sanctuary trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Activate Seraph Sanctuary by tapping it, adding {C}.
Repeat.

Infinite colorless mana

Trench Behemoth

Seraph Sanctuary

Activate Trench Behemoth by returning Radiant Fountain from the battlefield to your hand, untapping it.
Play Radiant Fountain, triggering it and Fastbond.
Resolve the Radiant Fountain trigger, causing you to gain 2 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Activate Radiant Fountain by tapping it, adding {C}.
Repeat.

Radiant Fountain

Activate Trench Behemoth by returning Plaza of Harmony from the battlefield to your hand, untapping it.
Play Plaza of Harmony, triggering it and Fastbond.
Resolve the Plaza of Harmony trigger, causing you to gain 3 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Activate Plaza of Harmony by tapping it, adding either {C} or one mana of any type a Gate you control could produce.
Repeat.

Infinite mana Gates you control can produce

Plaza of Harmony

Activate Trench Behemoth by returning Glimmerpost from the battlefield to your hand, untapping it.
Play Glimmerpost, triggering it and Fastbond.
Resolve the Glimmerpost trigger, causing you to gain at least 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Activate Glimmerpost by tapping it, adding {C}.
Repeat.

Glimmerpost

Activate Trench Behemoth by returning Thornwood Falls from the battlefield to your hand, untapping it.
Play Thornwood Falls, triggering it and Fastbond.
Resolve the Thornwood Falls trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Thornwood Falls

Activate Trench Behemoth by returning Tranquil Cove from the battlefield to your hand, untapping it.
Play Tranquil Cove, triggering it and Fastbond.
Resolve the Tranquil Cove trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Tranquil Cove

Activate Trench Behemoth by returning Swiftwater Cliffs from the battlefield to your hand, untapping it.
Play Swiftwater Cliffs, triggering it and Fastbond.
Resolve the Swiftwater Cliffs trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Swiftwater Cliffs

Activate Trench Behemoth by returning Sejiri Refuge from the battlefield to your hand, untapping it.
Play Sejiri Refuge, triggering it and Fastbond.
Resolve the Sejiri Refuge trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Sejiri Refuge

Activate Trench Behemoth by returning Rugged Highlands from the battlefield to your hand, untapping it.
Play Rugged Highlands, triggering it and Fastbond.
Resolve the Rugged Highlands trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Rugged Highlands

Activate Trench Behemoth by returning Kazandu Refuge from the battlefield to your hand, untapping it.
Play Kazandu Refuge, triggering it and Fastbond.
Resolve the Kazandu Refuge trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Kazandu Refuge

Activate Trench Behemoth by returning Kabira Crossroads from the battlefield to your hand, untapping it.
Play Kabira Crossroads, triggering it and Fastbond.
Resolve the Kabira Crossroads trigger, causing you to gain 2 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Kabira Crossroads

Activate Trench Behemoth by returning Jwar Isle Refuge from the battlefield to your hand, untapping it.
Play Jwar Isle Refuge, triggering it and Fastbond.
Resolve the Jwar Isle Refuge trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Jwar Isle Refuge

Activate Trench Behemoth by returning Jungle Hollow from the battlefield to your hand, untapping it.
Play Jungle Hollow, triggering it and Fastbond.
Resolve the Jungle Hollow trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Jungle Hollow

Activate Trench Behemoth by returning Graypelt Refuge from the battlefield to your hand, untapping it.
Play Graypelt Refuge, triggering it and Fastbond.
Resolve the Graypelt Refuge trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Graypelt Refuge

Activate Trench Behemoth by returning Dismal Backwater from the battlefield to your hand, untapping it.
Play Dismal Backwater, triggering it and Fastbond.
Resolve the Dismal Backwater trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Dismal Backwater

Activate Trench Behemoth by returning Blossoming Sands from the battlefield to your hand, untapping it.
Play Blossoming Sands, triggering it and Fastbond.
Resolve the Blossoming Sands trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Blossoming Sands

Activate Trench Behemoth by returning Wind-Scarred Crag from the battlefield to your hand, untapping it.
Play Wind-Scarred Crag, triggering it and Fastbond.
Resolve the Wind-Scarred Crag trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Wind-Scarred Crag

Activate Trench Behemoth by returning Scoured Barrens from the battlefield to your hand, untapping it.
Play Scoured Barrens, triggering it and Fastbond.
Resolve the Scoured Barrens trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Scoured Barrens

Activate Trench Behemoth by returning Crypt of the Eternals from the battlefield to your hand, untapping it.
Play Crypt of the Eternals, triggering it and Fastbond.
Resolve the Crypt of the Eternals trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Activate Crypt of the Eternals' first ability by tapping it, adding {C}.
Repeat.

Crypt of the Eternals

Activate Trench Behemoth by returning Bloodfell Caves from the battlefield to your hand, untapping it.
Play Bloodfell Caves, triggering it and Fastbond.
Resolve the Bloodfell Caves trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Bloodfell Caves

Activate Trench Behemoth by returning Akoum Refuge from the battlefield to your hand, untapping it.
Play Akoum Refuge, triggering it and Fastbond.
Resolve the Akoum Refuge trigger, causing you to gain 1 life.
Resolve the Fastbond trigger, dealing 1 damage to you.
Repeat.

Combos with "Fastbond"