Mortuary + Chamber Sentry + Gwenom, Remorseless

Mortuary

Chamber Sentry

Gwenom, Remorseless

How it works

1. Cast Chamber Sentry either from your hand by paying 0 or from the top of your library by paying 0 life.
2. Chamber Sentry enters and dies as a state-based action due to having 0 toughness.
3. Mortuary triggers, putting Chamber Sentry from your graveyard onto the top of your library.
4. Repeat.

This clever loop relies on Mortuary to intercept Chamber Sentry every time it hits the graveyard, recycling the construct straight back to the top of your library. From there, Gwenom, Remorseless allows you to play Chamber Sentry directly off the top without spending mana, substituting its mana value with a life payment instead. Because Chamber Sentry enters with zero toughness when cast for zero, it instantly collapses into the graveyard as a state-based action, resetting the whole sequence to generate infinite enters-the-battlefield, leaves-the-battlefield, and death triggers alongside an infinite storm count.