Shifting Woodland + Aftermath Analyst + Lithatog + Tiller Engine

Shifting Woodland

Aftermath Analyst

Lithatog

Tiller Engine

How it works

1. Activate Lithatog's second ability by sacrificing any land except Shifting Woodland, giving Lithatog +1/+1 until end of turn.
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 elegant loop turns your graveyard into a self-sustaining engine by letting Shifting Woodland temporarily assume the identity of Aftermath Analyst. Once you've whittled down your other lands by feeding them to Lithatog's sacrifice ability to pump its power, Shifting Woodland uses its delirium ability to copy the Analyst and immediately sacrifice itself along with the rest of your graveyard's lands. This mass return triggers Tiller Engine for every single land entering the battlefield tapped, instantly untapping them so they can be tapped for mana again to fuel the cycle.