Mortuary + Krark-Clan Grunt + Bolas's Citadel + Shield Sphere

Mortuary

Krark-Clan Grunt

Bolas's Citadel

Shield Sphere

How it works

1. Activate Krark-Clan Grunt by sacrificing Shield Sphere
2. When Shield Sphere dies, Mortuary triggers, putting Shield Sphere from your graveyard onto the top of your library.
3. Resolve the Krark-Clan Grunt ability.
4. Cast Shield Sphere from the top of your library by paying 0 life.
5. Repeat.

This clever loop turns the zero-cost artifact Shield Sphere into an endless fuel source by letting Mortuary intercept the tiny wall the moment it hits the graveyard, neatly tucking it back onto the top of your library. From there, Bolas's Citadel allows you to play that same Shield Sphere directly off the library for zero life, completely bypassing traditional mana costs. With Krark-Clan Grunt standing by to sacrifice the sphere over and over again, you can repeat this cycle indefinitely to pump the Grunt to staggering proportions while racking up an infinite storm count, death triggers, and sacrifice counts.