Mortuary + Realmwalker + Endless One

Mortuary

Realmwalker

Endless One

How it works

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

By casting Endless One for zero mana, you immediately send it straight to the graveyard where state-based actions send it, triggering Mortuary to seamlessly loop the creature right back onto the top of your library. Meanwhile, Realmwalker's changeling nature ensures it qualifies for any chosen creature type, granting you the crucial ability to look at that top card and cast Endless One directly off the library over and over again. This self-sustaining engine generates infinite death triggers, enter-the-battlefield effects, and storm count entirely for free.