Springheart Nantuko | Overlord of the Hauntwoods | Groundchuck & Dirtbag (and one other card)

Cards

All permanents on the battlefield (
Springheart Nantuko attached to
Overlord of the Hauntwoods and
Overlord of the Hauntwoods without summoning sickness).

Declare
Overlord of the Hauntwoods as an attacker.
Overlord of the Hauntwoods triggers, creating an untapped Everywhere land token due to
Horizon Explorer.
When the Everywhere token enters the battlefield,
Springheart Nantuko triggers.
Holding priority, activate Everywhere by tapping it, adding ({G} magic symbol) .
Groundchuck & Dirtbag triggers, adding ({G} magic symbol) .
Resolve the
Springheart Nantuko trigger, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a token copy of
Overlord of the Hauntwoods.
When the
Overlord of the Hauntwoods token enters the battlefield, it triggers, creating a tapped Everywhere land token.
Repeat from step 3.

This combo has been estimated to be Exhibition (Bracket 1+).