Murasa Rootgrazer + Retreat to Coralhelm + Estrid's Invocation

Murasa Rootgrazer

Retreat to Coralhelm

Estrid's Invocation

How it works

1. Activate Murasa Rootgrazer's first ability, putting a basic land from your hand onto the battlefield.
2. The Retreat to Coralhelms trigger.
3. In response, activate the basic land by tapping it, adding 1.
4. Let the first Retreat to Coralhelm trigger resolve, untapping Murasa Rootgrazer.
5. Activate Murasa Rootgrazer's last ability, returning any basic land you control from the battlefield to your hand.
6. Let the second Retreat trigger resolve, untapping Murasa Rootgrazer.
7. Repeat.

This clever loop leverages Retreat to Coralhelm as the engine that untaps Murasa Rootgrazer over and over again whenever a land enters the battlefield. By bouncing and replaying your basic lands, you generate an endless stream of landfall triggers and mana. Meanwhile, Estrid's Invocation can effortlessly copy Retreat to Coralhelm to ensure you have the untap effect ready if your primary enchantment is disrupted, tying this entire self-sustaining mana- and trigger-engine together.