Mortuary + Blasting Station + Bolas's Citadel + Bontu's Monument

Mortuary

Blasting Station

Bolas's Citadel

Bontu's Monument

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 elegant loop transforms a cheap creature into a relentless, self-sustaining engine of attrition. By letting Bolas's Citadel bypass traditional mana costs with life payments, you can recast your sacrificed threat right off the top of your library, a process made even easier on your life total thanks to the life-padding drain from Bontu's Monument. Meanwhile, Mortuary ensures the creature never stays in the graveyard for long by seamlessly recycling it back to the library's peak. Finally, Blasting Station acts as both the sacrificial outlet and the win condition, untapping upon each new arrival to continuously deal lethal damage to your opponents.