Preston, the Vanisher + Fiend Hunter + Lumbering Battlement + Pegasus Guardian // Rescue the Foal

Preston, the Vanisher

Fiend Hunter

Lumbering Battlement

Pegasus Guardian // Rescue the Foal

How it works

1. Cast Rescue the Foal by paying 1, blinking Lumbering Battlement and exiling Rescue the Foal.
2. When Lumbering Battlement enters the battlefield, it and Preston trigger.
3. Resolve the Lumbering Battlement trigger, exiling Fiend Hunter until Lumbering Battlement leaves the battlefield.
4. When Fiend Hunter leaves the battlefield, its second ability triggers, returning any cards exiled with it to the battlefield under their owner's control.
5. Resolve the Preston trigger, creating a copy of Lumbering Battlement that is a 0/1 Illusion.
6. When the token Lumbering Battlement enters the battlefield, it triggers, exiling the nontoken Lumbering Battlement until the token Lumbering Battlement leaves the battlefield.
7. The nontoken Lumbering Battlement leaves the battlefield, returning Fiend Hunter from exile to the battlefield.
8. When Fiend Hunter enters the battlefield, its first ability and Preston trigger.
9. Resolve the Preston trigger, creating a token copy of Fiend Hunter that is a 0/1 Illusion.
10. When the token Fiend Hunter enters the battlefield, it triggers, choose not to exile a creature.
11. Resolve the Fiend Hunter trigger, exiling the token Lumbering Battlement.
12. The token Lumbering Battlement leaves the battlefield, returning the nontoken Lumbering Battlement from exile to the battlefield.
13. Repeat from step 2.

This intricate loop gets its start from the adventure side, Rescue the Foal, which kicks things off by blinking Lumbering Battlement and setting up a cascading sequence of enter-the-battlefield triggers. As Lumbering Battlement bounces in and out of exile, it repeatedly teams up with Fiend Hunter to trigger Preston, the Vanisher, whose presence turns every uncast creature entry into a fresh 0/1 Illusion copy that sustains the loop. Meanwhile, Pegasus Guardian stands ready to reap the rewards of this constant commotion, utilizing the fact that permanents are perpetually leaving the battlefield to flood your board with flying Pegasus tokens.