Shifting Woodland + Aftermath Analyst + Archelos, Lagoon Mystic + Coastal Hornclaw

Shifting Woodland

Aftermath Analyst

Archelos, Lagoon Mystic

Coastal Hornclaw

How it works

1. Activate Coastal Hornclaw by sacrificing any land except Shifting Woodland.
2. Repeat step 1 until you control no other lands except Shifting Woodland.
3. Activate Shifting Woodland's second ability by paying 2, causing it to become a copy of Aftermath Analyst until end of turn.
4. Activate Shifting Woodland by paying 3 and sacrificing it, returning it and all other land cards from your graveyard to the battlefield untapped due to Archelos.
5. Activate any number of lands by tapping them, adding at least 5.
6. Repeat.