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 .
Zendikar Resurgent 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 clever loop transforms a simple land drop into an engine of endless multiplication, fueled by the cascading mana production of Zendikar Resurgent to pay for Springheart Nantuko's landfall ability time and again. Because the tokens enter as Dryad Arbor—which functions simultaneously as a land and a creature—every fresh copy immediately triggers more landfalls while also instantly tapping for green mana to sustain the loop. Meanwhile, Urabrask the Hidden ensures that this sudden swarm of new creatures arrives without slowing down, keeping the compounding advantage completely unopposed.