Leonin Relic-Warder + Rescue Skiff + Yahenni, Undying Partisan

Leonin Relic-Warder

Rescue Skiff

Yahenni, Undying Partisan

How it works

1. Cast Leonin Relic-Warder by paying .
2. When Leonin Relic-Warder enters, its first ability triggers, exiling Rescue Skiff.
3. Activate Yahenni by sacrificing Leonin Relic-Warder.
4. When Leonin Relic-Warder dies, its second ability triggers, returning Rescue Skiff from exile to the battlefield.
5. When Rescue Skiff enters, it triggers, returning Leonin Relic-Warder from your graveyard to the battlefield.
6. When Leonin Relic-Warder enters, its first ability triggers, exiling Rescue Skiff.
7. Resolve the Yahenni ability from step 3.
8. Repeat from step 3.

This clever loop sets up an infinite cycle by having Leonin Relic-Warder and Rescue Skiff continuously rescue one another from exile and the graveyard. As Leonin Relic-Warder enters to exile the Spacecraft, you sacrifice it to Yahenni, Undying Partisan, which triggers the Spacecraft's entry ability to bring the Cat back to the battlefield. Meanwhile, Yahenni feeds on the endless stream of dying creatures to grow infinitely large, turning a simple mechanical recursion into a lethal threat.