Estrid's Invocation + Murasa Rootgrazer + Retreat to Coralhelm

GWU identity

Commander legal

The 3 combo pieces

What must be in place

At least one basic land in hand.
Estrid's Invocation is a copy of Retreat to Coralhelm.
Murasa Rootgrazer does not have summoning sickness.

How to execute it

  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.

What the combo produces