Ich-Tekik, Salvage Splicer + Arcbound Reclaimer + Bolas's Citadel + Dark Sphere

Ich-Tekik, Salvage Splicer

Arcbound Reclaimer

Bolas's Citadel

Dark Sphere

How it works

1. Activate Dark Sphere by tapping and sacrificing it.
2. Ich-Tekik's second ability triggers, putting a +1/+1 counter on it and each Golem you control.
3. Resolve the Dark Sphere ability.
4. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Dark Sphere from your graveyard onto the top of your library.
5. Cast Dark Sphere from the top of your library by paying 0 life.
6. Repeat.

This clever loop lets you endlessly recycle artifacts by turning Bolas's Citadel into a free card-casting engine from the top of your library. You sacrifice Dark Sphere to its own activation, which sends it to the graveyard and triggers Ich-Tekik, Salvage Splicer to grow itself and your Golems with +1/+1 counters. You can then use one of those newly placed counters to fuel Arcbound Reclaimer's activated ability, placing Dark Sphere right back on top of your library where Bolas's Citadel allows you to cast it again for zero life.