Mortuary + Wild Cantor + Bolas's Citadel + Blood Artist

Mortuary

Wild Cantor

Bolas's Citadel

Blood Artist

How it works

1. Activate Wild Cantor by sacrificing it.
2. When Wild Cantor dies, Mortuary and Blood Artist trigger.
3. Resolve the Mortuary trigger, putting Wild Cantor from your graveyard onto the top of your library.
4. Resolve the Blood Artist trigger, causing you to gain 1 life and target opponent to lose 1 life.
5. Cast Wild Cantor from the top of your library by paying 1 life.
6. Repeat.

This elegant loop turns life into an infinite fountain of triggers and mana by leveraging the top of your library as a hidden hand. With Bolas's Citadel allowing you to cast Wild Cantor straight from the library while substituting its mana cost with a mere 1 life payment, the creature cycles endlessly back into place thanks to Mortuary tucking it away the moment it hits the graveyard. Meanwhile, Blood Artist feeds on this continuous cycle to drain your opponents dry and pad your life total, ensuring you never run out of the vital resource required to keep Citadel firing away.