Zask, Skittering Swarmlord, Azusa, Lost but Seeking, and Glacial Chasm

Prerequisites

• Zask, Skittering Swarmlord on the battlefield
• Azusa, Lost but Seeking on the battlefield
• Glacial Chasm in hand or in the graveyard
• You control at least one additional land

Steps

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. Pass the turn
4. At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, causing you to sacrifice it
5. Play a land except Glacial Chasm from your graveyard
6. Repeat

Results

• Prevent all damage that would be dealt to you