Mirrorpool + Splendid Reclamation + Archelos, Lagoon Mystic + Trenching Steed

Mirrorpool

Splendid Reclamation

Archelos, Lagoon Mystic

Trenching Steed

How it works

1. Cast Splendid Reclamation by paying 3.
2. Holding priority, activate any number of lands you control except Mirrorpool by tapping them, adding at least 2C.
3. Activate Trenching Steed by sacrificing a land other than Mirrorpool.
4. Repeat step 3 until Mirrorpool is the only land you control.
5. Activate Mirrorpool's second ability by paying 2C, tapping and sacrificing it, copying Splendid Reclamation.
6. Resolve the Splendid Reclamation copy, returning all land cards from your graveyard to the battlefield untapped due to Archelos.
7. Repeat from step 2.