Glacial Chasm + Thalia and The Gitrog Monster + Ramunap Excavator

Glacial Chasm

Thalia and The Gitrog Monster

Ramunap Excavator

How it works

1. Play Glacial Chasm either from your hand or from your graveyard.
2. When Glacial Chasm enters the battlefield, its second ability triggers, causing you to sacrifice another land you control.
3. Play any land from your graveyard.
4. At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, allowing you to choose not to pay the cost and sacrifice it instead.
5. Repeat.

This elegant lock turns Glacial Chasm into an impervious shield by weaponizing its own upkeep. While Glacial Chasm prevents all damage dealt to you at the cost of sacrificing a land, Ramunap Excavator steps in to bypass that drawback entirely by letting you replay your lands right out of your graveyard. Meanwhile, Thalia and The Gitrog Monster not only grants you the extra land drop needed to keep the cycle going smoothly, but its attack trigger also gives you an alternate way to bin a land when you need to reset the Chasm's sacrifice requirement.