Mortuary + Blasting Station + Bontu's Monument + Gwenom, Remorseless

Mortuary

Blasting Station

Bontu's Monument

Gwenom, Remorseless

How it works

1. Activate Blasting Station by tapping it and sacrificing a creature with mana value 1 or less.
2. When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library.
3. Resolve the Blasting Station ability.
4. Cast the creature from the top of your library by paying 1 life.
5. Bontu's Monument triggers, causing you to gain 1 life and each opponent to lose 1 life.
6. When the creature enters, Blasting Station triggers, untapping Blasting Station.
7. Repeat.

This loop turns a modest sacrifice outlet into a lethal engine by turning your library into a revolving door for cheap threats. You feed a creature to Blasting Station, and thanks to Mortuary, that creature immediately skips the graveyard and returns straight to the top of your library. From there, Gwenom, Remorseless lets you recast it directly off the top—bypassing its normal mana cost by paying life instead—which neatly offsets the life drain. Meanwhile, Bontu's Monument and Blasting Station's untap trigger turn every single iteration of this cycle into a zero-cost loop that drains your opponents out of the game while generating a ceaseless cascade of enters-the-battlefield and death triggers.