Mortuary + Liliana, Dreadhorde General + Chamber Sentry

Mortuary

Liliana, Dreadhorde General

Chamber Sentry

How it works

1. Cast Chamber Sentry by paying 0.
2. Chamber Sentry enters and dies as a state-based action due to having 0 toughness, triggering Mortuary and Liliana, Dreadhorde General.
3. Resolve the Mortuary trigger, putting Chamber Sentry from your graveyard onto the top of your library.
4. Resolve the Liliana, Dreadhorde General trigger, causing you to draw a card, thus drawing Chamber Sentry from your library.
5. Repeat.

This clever loop turns Chamber Sentry's zero-mana casting cost into a perpetual motion machine by exploiting its immediate trip to the graveyard. Because Chamber Sentry hits the bin instantly, Mortuary seamlessly intercepts it to slide the automaton right back onto the top of your library. Meanwhile, Liliana, Dreadhorde General watches the continuous procession of dying creatures to reward you with a fresh card draw every single iteration, netting you infinite draw triggers and letting you cycle the Sentry endlessly.