Mortuary + Goblin Bombardment + Bolas's Citadel + Crookshank Kobolds

Mortuary

Goblin Bombardment

Bolas's Citadel

Crookshank Kobolds

How it works

1. Activate Goblin Bombardment by sacrificing Crookshank Kobolds
2. When Crookshank Kobolds dies, Mortuary triggers, putting Crookshank Kobolds from your graveyard onto the top of your library.
3. Resolve the Goblin Bombardment ability.
4. Cast Crookshank Kobolds from the top of your library by paying 0 life.
5. Repeat.

This elegant loop turns the humble Crookshank Kobolds into an endless engine of destruction by turning its free mana value into pure fuel. With Bolas's Citadel allowing you to continually cast the Kobolds straight from the top of your library for zero life, Goblin Bombardment provides the necessary outlet to sacrifice them for damage. Meanwhile, Mortuary acts as the crucial glue that intercepts the creature in your graveyard and immediately tucks it back onto your library, keeping the loop perpetually primed.