Mortuary + Viscera Seer + Crimson Kobolds + Gwenom, Remorseless

Mortuary

Viscera Seer

Crimson Kobolds

Gwenom, Remorseless

How it works

1. Activate Viscera Seer by sacrificing Crimson Kobolds
2. When Crimson Kobolds dies, Mortuary triggers, putting Crimson Kobolds from your graveyard onto the top of your library.
3. Resolve the Viscera Seer ability.
4. Cast Crimson Kobolds from the top of your library by paying 0 life.
5. Repeat.

This loop creates an infinite cascade of sacrifices by exploiting the zero-mana cost of Crimson Kobolds, which allows you to repeatedly feed it to Viscera Seer. Whenever the Kobolds hit the graveyard, Mortuary steps in to redirect them straight to the top of your library instead of letting them stay there. Meanwhile, Gwenom, Remorseless provides the crucial alternate permission to cast creatures directly from the top of your library, swapping normal mana payments for life that effectively costs you nothing for a zero-mana creature.