Prowling Geistcatcher + Saffi Eriksdotter + Ashnod's Altar

Prowling Geistcatcher

Saffi Eriksdotter

Ashnod's Altar

How it works

1. Activate Saffi by sacrificing it, targeting Prowling Geistcatcher.
2. When Saffi dies, Prowling Geistcatcher's first ability triggers, exiling Saffi from your graveyard.
3. Resolve the Saffi ability.
4. Activate Ashnod's Altar by sacrificing Prowling Geistcatcher, adding CC.
5. When Prowling Geistcatcher dies, its second ability and Saffi trigger.
6. Resolve the Saffi trigger, returning Prowling Geistcatcher from your graveyard to the battlefield.
7. Resolve the Prowling Geistcatcher trigger, returning Saffi from exile to the battlefield.
8. Repeat.

This clever loop relies on a clever interplay of exile and graveyard recursion to keep the engine humming. By targeting Prowling Geistcatcher with Saffi Eriksdotter's sacrifice ability, you prime the Geistcatcher to return whenever it next hits the graveyard; meanwhile, the Geistcatcher's own triggered ability cleverly catches Saffi in exile instead, ensuring she can be brought right back. Ashnod's Altar provides the sacrifice outlet and generates a steady stream of colorless mana with every iteration of the loop. Together, these pieces feed off each other to generate endless sacrifices, entering-the-battlefield triggers, and a massive pool of mana.