Mortuary + Crimson Kobolds + Bolas's Citadel + Bloodflow Connoisseur

Mortuary

Crimson Kobolds

Bolas's Citadel

Bloodflow Connoisseur

How it works

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

This loop relies on Crimson Kobolds as a perpetual sacrifice fuel that costs nothing to cast, allowing it to cycle endlessly between the battlefield and your library. Bolas's Citadel plays a vital role by letting you cast that zero-mana creature straight off the top of your deck while bypassing its mana cost entirely with life. Whenever the Kobolds hit the graveyard, Mortuary intercepts them to place the card right back on top of your library for the Citadel to catch again. Meanwhile, Bloodflow Connoisseur converts this endless cycle into massive stat growth, giving you limitless sacrifices, death triggers, and a towering vampire.