Mortuary + Realmwalker + Ugin's Conjurant

Mortuary

Realmwalker

Ugin's Conjurant

How it works

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

This loop turns a zero-mana investment into an endless storm by leveraging Realmwalker's changeling nature and top-deck casting permission to continually replay Ugin's Conjurant. Because Ugin's Conjurant enters the battlefield with zero toughness when cast for free, it immediately heads to the graveyard as a state-based action, which triggers Mortuary to seamlessly recycle the creature right back to the top of your library. Realmwalker ensures you can cast it again instantly, feeding an infinite cascade of creature enters-the-battlefield, leaves-the-battlefield, death triggers, and storm count.