Avenging Druid + Retreat to Coralhelm + Lightning Prowess

Avenging Druid

Retreat to Coralhelm

Lightning Prowess

How it works

1. Activate Avenging Druid by tapping it, dealing 1 damage to an opponent.
2. Avenging Druid triggers, causing you to reveal a land card from your library and put it onto the battlefield, and put all other cards revealed this way into your graveyard.
3. When the land enters the battlefield, Retreat to Coralhelm triggers, untapping Avenging Druid.
4. Repeat until no lands remain in your library and/or your library is empty.

This elegant setup turns Avenging Druid into a self-fueling engine of discovery and erosion. By enchanting the Druid with Lightning Prowess, you gain the crucial ability to tap it for direct damage, instantly triggering its text to mine your library for lands. Every time one of those lands enters the battlefield, Retreat to Coralhelm answers the landfall trigger by untapping the Druid, allowing you to repeat the entire process until your library is completely emptied and your battlefield is flooded with every land you own.