Mortuary + Fleshtaker + Bolas's Citadel + Goblin Firestarter

Mortuary

Fleshtaker

Bolas's Citadel

Goblin Firestarter

How it works

1. Activate Goblin Firestarter by sacrificing it.
2. When Goblin Firestarter dies, Mortuary and Fleshtaker trigger.
3. Resolve the Fleshtaker trigger, causing you to gain 1 life and scry 1.
4. Resolve the Mortuary trigger, putting Goblin Firestarter from your graveyard onto the top of your library.
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 unstoppable engine of endless death and fiery retribution. By leveraging Mortuary, every time you sacrifice the Goblin, it neatly returns straight to the top of your library instead of lingering in the graveyard. Bolas's Citadel then allows you to cast that very same Goblin directly from the top of your library, paying a tiny fraction of your life total rather than its mana cost, a cost easily offset and capitalized upon by Fleshtaker. As Fleshtaker rewards your endless stream of creature sacrifices with life and scry manipulation, your Goblin Firestarter can be repeatedly fired off to obliterate your opponents in a flurry of infinite damage and storm count.