Mortuary + Goblin Bombardment + Bolas's Citadel + Willow Geist

Mortuary

Goblin Bombardment

Bolas's Citadel

Willow Geist

How it works

1. Activate Goblin Bombardment by sacrificing Willow Geist.
2. When Willow Geist dies, it and Mortuary triggers.
3. Resolve the Mortuary trigger, putting Willow Geist from your graveyard onto the top of your library.
4. Resolve the Willow Geist trigger, causing you to gain 1 life.
5. Resolve the Goblin Bombardment ability.
6. Cast Willow Geist from the top of your library by paying 1 life due to Bolas's Citadel.
7. Repeat.

This elegant loop centers on Bolas's Citadel, which lets you bypass traditional mana costs by paying life to cast creatures straight from the top of your library. When you sacrifice Willow Geist to Goblin Bombardment, Mortuary steps in to instantly recycle the geist right back to the top of your library instead of letting it rest in peace. Meanwhile, Willow Geist's own death trigger catches the card leaving the graveyard and hands you a life cushion to offset the Citadel's toll, letting you repeat the cycle indefinitely for infinite damage and storm count.