Retreat to Coralhelm + Golgari Rot Farm + Scaled Herbalist

Retreat to Coralhelm

Golgari Rot Farm

Scaled Herbalist

How it works

1. Activate Scaled Herbalist by tapping it, putting Golgari Rot Farm from your hand onto the battlefield.
2. When Golgari Rot Farm enters the battlefield, it and Retreat to Coralhelm trigger.
3. Resolve the Golgari Rot Farm trigger, returning itself from the battlefield to your hand.
4. Resolve the Retreat to Coralhelm trigger, untapping Scaled Herbalist.
5. Repeat.

This engine relies on a brilliant loop of land-dropping and untapping to generate infinite landfall triggers. Scaled Herbalist acts as your engine's foundation, letting you manually drop Golgari Rot Farm straight from your hand onto the battlefield. Because Golgari Rot Farm bounces itself back to your hand upon entry, it continuously refuels your hand while triggering Retreat to Coralhelm; that enchantment's landfall ability responds by constantly untapping Scaled Herbalist so you can repeat the whole cycle anew.