Leonin Relic-Warder + Rescue Skiff + Umbral Collar Zealot

Leonin Relic-Warder

Rescue Skiff

Umbral Collar Zealot

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 Umbral Collar Zealot 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 Umbral Collar Zealot ability from step 3.
8. Repeat from step 3.

This infinite loop relies on a clever recursion cycle between Leonin Relic-Warder and Rescue Skiff. When Leonin Relic-Warder enters the battlefield, its triggered ability exiles the Rescue Skiff, which immediately triggers the Spacecraft's entry ability to bring the Leonin Relic-Warder right back from the graveyard when you sacrifice it to Umbral Collar Zealot's activation. Because Umbral Collar Zealot lets you sacrifice the Leonin Relic-Warder as part of the loop, you can continuously repeat this process to endlessly churn through your deck with infinite surveil triggers while racking up endless enters-the-battlefield and death events.