Mortuary + Goblin Bombardment + Bolas's Citadel + Bontu's Monument

Mortuary

Goblin Bombardment

Bolas's Citadel

Bontu's Monument

How it works

1. Activate Goblin Bombardment by 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 Goblin Bombardment 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. Repeat.

This loop turns a humble low-cost creature into an unstoppable engine of attrition by recycling it endlessly through the library. You sacrifice the creature to Goblin Bombardment to deal damage, which immediately triggers Mortuary to place that exact creature card right back on top of your library. From there, Bolas's Citadel allows you to recast it for a mere 1 life instead of its mana cost, letting you churn through your deck without spending actual mana. Meanwhile, Bontu's Monument pads your life total and drains your opponents on every single cast, effortlessly sustaining the life payment required by Bolas's Citadel while draining the table dry.