Activate Crystal Vein's second ability by tapping and sacrificing it, adding {C}{C}.
Activate Scaretiller by tapping it.
Scaretiller triggers, returning Crystal Vein from your graveyard to the battlefield tapped.
Crystal Vein enters the battlefield tapped, triggering Amulet of Vigor, untapping Crystal Vein.
Resolve the Scaretiller ability from step 2, dealing 1 damage to any target.
Activate Voltaic Construct by paying {2}, untapping Scaretiller.
Repeat.

Infinite damage

Infinite landfall triggers

Scaretiller

Voltaic Construct

Crystal Vein

Amulet of Vigor

Viridian Longbow

Activate Crystal Vein's second ability by tapping and sacrificing it, adding {C}{C}.
Activate Scaretiller by tapping it.
Scaretiller triggers, returning Crystal Vein from your graveyard to the battlefield tapped.
Crystal Vein enters the battlefield tapped, triggering Tiller Engine, untapping Crystal Vein.
Resolve the Scaretiller ability from step 2, dealing 1 damage to any target.
Activate Voltaic Construct by paying {2}, untapping Scaretiller.
Repeat.

Tiller Engine

Activate Crystal Vein's second ability by tapping and sacrificing it, adding {C}{C}.
Activate Scaretiller by tapping it.
Scaretiller triggers, returning Crystal Vein from your graveyard to the battlefield untapped due to Archelos.
Resolve the Scaretiller ability from step 2, dealing 1 damage to any target.
Activate Voltaic Construct by paying {2}, untapping Scaretiller.
Repeat.

Combos with "Crystal Vein"