Springheart Nantuko + Overlord of the Hauntwoods + Mana Reflection + Archelos, Lagoon Mystic

Springheart Nantuko

Overlord of the Hauntwoods

Mana Reflection

Archelos, Lagoon Mystic

How it works

1. Declare Overlord of the Hauntwoods as an attacker.
2. Overlord of the Hauntwoods triggers, creating an untapped Everywhere land token due to Archelos.
3. When the Everywhere token enters the battlefield, Springheart Nantuko triggers.
4. Holding priority, activate Everywhere by tapping it, adding .
5. Resolve the Springheart Nantuko trigger, causing you to pay 1 to create a token copy of Overlord of the Hauntwoods.
6. When the Overlord of the Hauntwoods token enters the battlefield, it triggers, creating a tapped Everywhere land token.
7. Repeat from step 3.

This intricate loop relies on Archelos, Lagoon Mystic keeping permanents untapped so that when Overlord of the Hauntwoods attacks, its triggered ability creates an Everywhere land token that enters the battlefield ready to use. Tapping that newly spawned Everywhere token in response to Springheart Nantuko's landfall trigger easily generates the mana needed to pay for the Nantuko's ability. That payment successfully copies Overlord of the Hauntwoods, which in turn drops another Everywhere token upon arrival to keep the cycle going. Meanwhile, Mana Reflection sits in play as a massive potential amplifier, though this specific engine runs smoothly entirely on the generous land-typing and token-copying synergy of the rest of the board.