Springheart Nantuko | Mutable Explorer | Lotus Cobra (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 three token copies of
Mutable Explorer.
When the
Mutable Explorer tokens enter, they trigger.
Resolve the first
Mutable Explorer trigger, creating a Mutavault land token that enters tapped.
When the Mutavault token enters,
Springheart Nantuko and
Lotus Cobra trigger.
Resolve the
Lotus Cobra trigger, adding ({G} magic symbol) .
Resolve the
Springheart Nantuko trigger, choosing not to pay and creating three 1/1 Insect creature tokens.
Repeat from step 4 for the second trigger.
Repeat from step 4 for the third trigger, instead choosing to pay for
Springheart Nantuko's trigger to create three token copies of
Mutable Explorer.
Repeat from step 3.