Mortuary + Viscera Seer + Memnite + Bolas's Citadel

Mortuary

Viscera Seer

Memnite

Bolas's Citadel

How it works

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

This clever loop transforms free-casting into an endless engine by leveraging Bolas's Citadel to play spells directly from the top of your library for life instead of mana. Since Memnite has a mana value of zero, you can cast it repeatedly without draining your life total. Viscera Seer provides the essential sacrifice outlet to send the automaton back to the graveyard, where Mortuary immediately catches it and places it right back on top of your library to be cast all over again.