Romana II + Mutable Explorer + Retreat to Coralhelm + Tiller Engine

Romana II

Mutable Explorer

Retreat to Coralhelm

Tiller Engine

How it works

1. Cast Mutable Explorer by paying 2.
2. When Mutable Explorer enters the battlefield, it triggers, creating a tapped Mutavault land token.
3. When the Mutavault token enters the battlefield, Tiller Engine and Retreat to Coralhelm trigger.
4. Reoslve the Tiller Engine trigger, untapping the Mutavault token.
5. Resolve the Retreat to Coralhelm trigger, untapping Romana II.
6. Activate the Mutavault token by tapping it, adding C.
7. Activate Romana II by paying 1 and tapping it, creating a tapped copy of the Mutavault token.
8. Repeat from step 3.