Mortuary + Cruel Celebrant + Bile Urchin + Bolas's Citadel

Mortuary

Cruel Celebrant

Bile Urchin

Bolas's Citadel

How it works

1. Activate Bile Urchin by sacrificing it.
2. When Bile Urchin dies, Mortuary and Cruel Celebrant trigger.
3. Resolve the Mortuary trigger, putting Bile Urchin from your graveyard onto the top of your library.
4. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life.
5. Resolve the Bile Urchin ability.
6. Cast Bile Urchin from the top of your library by paying 1 life.
7. Repeat.

This ingenious loop transforms Bolas's Citadel into a life-draining engine by letting you cast Bile Urchin straight from the top of your library for a mere 1 life instead of its mana cost. Every time you sacrifice the Urchin, Mortuary instantly catches it on the way to the graveyard and places it right back on top of your library. Meanwhile, Cruel Celebrant capitalizes on this endless cycle of sacrifice by draining your opponents out while padding your life total to keep the Citadel fueled.