Mortuary + Bolas's Citadel + Goblin Firestarter + Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel

Mortuary

Bolas's Citadel

Goblin Firestarter

Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel

How it works

1. Activate Goblin Firestarter by sacrificing it.
2. When Goblin Firestarter dies, Mortuary and Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel trigger.
3. Resolve the Mortuary trigger, putting Goblin Firestarter from your graveyard onto the top of your library.
4. Resolve the Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel trigger, causing you to gain 1 life and target opponent to lose 1 life.
5. Resolve the Goblin Firestarter ability.
6. Cast Goblin Firestarter from the top of your library by paying 1 life.
7. Repeat.

This loop turns a humble Goblin Firestarter into an engine of endless doom by using Mortuary to instantly recycle the goblin back to the top of your library every time it bites the dust. Bolas's Citadel makes casting it from the top effortless by trading your life total for mana, while Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel watches the creature endlessly die and return to bleed your opponents out through its draining triggers.