Play a land. When the land enters, Springheart Nantuko triggers, causing you to pay 1 to create a token copy of Dryad Arbor.
When the Dryad Arbor token enters, Springheart Nantuko triggers. Holding priority, activate the Dryad Arbor token by tapping it, adding .
Zhur-Taa Ancient triggers, adding .
Resolve the Springheart Nantuko trigger, causing you to pay 1 to create a token copy of Dryad Arbor.
Repeat from step 2.
This crafty loop turns a simple land drop into an engine of endless multiplication by weaponizing Springheart Nantuko's landfall ability to copy Dryad Arbor over and over. Every time a new Dryad Arbor token enters the battlefield, Zhur-Taa Ancient doubles the green mana it produces when tapped, generating the exact funds needed to pay for the next iteration of Springheart Nantuko's trigger. Meanwhile, having Anger sitting comfortably in your graveyard ensures that your massive horde of newly minted creatures can instantly attack without missing a beat.