Springheart Nantuko | Mutable Explorer | Tiller Engine (and one other card)

Cards

All permanents on the battlefield (
Springheart Nantuko attached to
Mutable Explorer).

Play a land.
When the land enters,
Springheart Nantuko triggers, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a token copy of
Mutable Explorer.
When the
Mutable Explorer token enters, it triggers, creating a Mutavault land token that enters tapped.
When the Mutavault token enters,
Springheart Nantuko,
Tiller Engine and
Lotus Cobra trigger.
Resolve the
Tiller Engine trigger, untapping the Mutavault token.
Holding priority, activate the Mutavault token by tapping it, adding ({C} magic symbol) .
Resolve the
Lotus Cobra trigger, 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
Mutable Explorer.
Repeat from step 3.

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