Leonin Relic-Warder + Rescue Skiff + Ashnod's Altar

Leonin Relic-Warder

Rescue Skiff

Ashnod's Altar

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 Ashnod's Altar 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. Repeat from step 3.

This elegant loop relies on Leonin Relic-Warder and Rescue Skiff continuously trading places in a recursive dance of exile and rebirth. Whenever the Relic-Warder enters, it swallows the Skiff, only to instantly trigger the Skiff's own entry ability when it falls to Ashnod's Altar, which cheerfully recycles the cat back to the battlefield while churning out a steady stream of colorless mana. Because Ashnod's Altar provides the sacrifice outlet needed to keep the triggers alternating between the two permanents, you generate an endless cascade of artifact and creature entries, leaves, and sacrifices.