Beifong's Bounty Hunters + Gravecrawler + Ashnod's Altar + Archelos, Lagoon Mystic

Beifong's Bounty Hunters

Gravecrawler

Ashnod's Altar

Archelos, Lagoon Mystic

How it works

1. Activate Ashnod's Altar by sacrificing Gravecrawler.
2. When Gravecrawler dies, Beifong's Bounty Hunters triggers, earthbending a land that can tap to produce at least .
3. Activate Ashnod's Altar by sacrificing the land.
4. When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield untapped due to Archelos.
5. Activate the land by tapping it, adding at least .
6. Cast Gravecrawler from your graveyard by paying .
7. Repeat.

This clever loop lets you feed Gravecrawler endlessly into Ashnod's Altar, generating infinite colorless mana along with a storm of death and sacrifice triggers. Beifong's Bounty Hunters acts as the engine's heart, turning every creature death into an earthbending trigger that animates one of your lands into a temporary creature. Since Archelos, Lagoon Mystic is untapped, that resurrected land happily enters the battlefield untapped, allowing you to tap it for the black mana needed to recast Gravecrawler right back from your graveyard.