Mortuary + Memnite + Bolas's Citadel + Bloodflow Connoisseur

Mortuary

Memnite

Bolas's Citadel

Bloodflow Connoisseur

How it works

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

This elegant loop lets you churn through your deck by turning a zero-mana artifact creature into a renewable resource. With Bolas's Citadel allowing you to play the top card of your library at the cost of your life total, you can repeatedly cast Memnite for free. Whenever Bloodflow Connoisseur sacrifices that Memnite, Mortuary immediately catches it on its way to the graveyard and stacks it right back on top of your library for the Citadel to play again.