All permanents on the battlefield (Springheart Nantuko attached to Dryad Arbor).
You have at least one land card in hand.
You are able to play a land this turn.
({1} magic symbol) ({G} magic symbol) available.
Steps
Play any land from your hand.
When the land enters the battlefield, Springheart Nantuko triggers, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a token copy of Dryad Arbor.
When the Dryad Arbor token enter the battlefield, Springheart Nantuko triggers.
Holding priority, activate the Dryad Arbor token by tapping it, adding ({G} magic symbol) .
Nissa 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 Dryad Arbor.