Shifting Woodland + Aftermath Analyst + Tiller Engine + Coastal Hornclaw

Shifting Woodland

Aftermath Analyst

Tiller Engine

Coastal Hornclaw

How it works

1. Activate Coastal Hornclaw by sacrificing any land except Shifting Woodland.
2. Repeat step 1 until you control no other lands except Shifting Woodland.
3. Activate Shifting Woodland's second ability by paying 2, causing it to become a copy of Aftermath Analyst until end of turn.
4. Activate Shifting Woodland by paying 3 and sacrificing it, returning it and all other land cards from your graveyard to the battlefield tapped.
5. When the lands enter the battlefield, Tiller Engine triggers that many times, untapping the lands.
6. Activate any number of lands by tapping them, adding at least 5.
7. Repeat.

This clever engine turns Coastal Hornclaw's land-sacrificing cost into fuel for a massive land recursion loop, once you've achieved delirium to activate Shifting Woodland. By paying to turn Shifting Woodland into a copy of Aftermath Analyst, you can sacrifice it to bring every single land back from your graveyard to the battlefield. Because Tiller Engine is there to automatically untap every land as it enters tapped, you immediately regain the ability to tap everything for mana and repeat the process indefinitely, generating boundless mana and landfall triggers.