Mortuary + Skirk Prospector + Bolas's Citadel + Bontu's Monument

Mortuary

Skirk Prospector

Bolas's Citadel

Bontu's Monument

How it works

1. Activate Skirk Prospector by sacrificing a Goblin 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. Cast the creature from the top of your library by paying 1 life.
4. Bontu's Monument triggers, causing you to gain 1 life and each opponent to lose 1 life.
5. Repeat.

This clever loop turns Skirk Prospector into a perpetual engine by using Mortuary to seamlessly recycle any sacrificed Goblin back onto the top of your library instead of letting it rest in the graveyard. Bolas's Citadel anchors the combo by letting you bypass mana costs altogether, allowing you to replay that same creature straight from the top of your library using your life total as currency. Meanwhile, Bontu's Monument quietly sustains your health pool by granting you life with every cast while simultaneously draining your opponents down to nothing.