Mystic Sanctuary + Dust Bowl + Walk the Aeons + Ramunap Excavator

Mystic Sanctuary

Dust Bowl

Walk the Aeons

Ramunap Excavator

How it works

1. Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
2. Activate Dust Bowl by paying 3, tapping it and sacrificing Mystic Sanctuary, destroying a nonbasic land.
3. Play Mystic Sanctuary from your graveyard.
4. When Mystic Sanctuary enters untapped, it triggers, putting Walk the Aeons from your graveyard onto the top of your library.
5. Move to your next turn, drawing Walk the Aeons during your draw step.
6. Repeat.

This elegant engine achieves near-infinite turns by exploiting the lands themselves as a recurring resource. Walk the Aeons provides the extra turns, while Mystic Sanctuary constantly recycles the spell back to the top of your library whenever it enters untapped, provided you control enough Islands to bypass its restriction. Ramunap Excavator is the linchpin that allows you to continuously play Mystic Sanctuary straight from the graveyard after it gets sacrificed, and Dust Bowl provides the exact sacrificial outlet needed to bin the land so the loop can start anew.