Archelos, Lagoon Mystic + Scaretiller + Voltaic Construct + Crystal Vein + Viridian Longbow

Archelos, Lagoon Mystic

Scaretiller

Voltaic Construct

Crystal Vein

Viridian Longbow

How it works

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