Springheart Nantuko + Overlord of the Hauntwoods + Spelunking + Groundchuck & Dirtbag

Decks

How it works

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Declare Overlord of the Hauntwoods as an attacker.
Overlord of the Hauntwoods triggers, creating an untapped Everywhere land token due to Spelunking.
When the Everywhere token enters the battlefield, Springheart Nantuko triggers.
Holding priority, activate Everywhere by tapping it, adding .
Groundchuck & Dirtbag triggers, adding .
Resolve the Springheart Nantuko trigger, causing you to pay 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.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.