You control a Forest that does not have summoning sickness and that enters the battlefield untapped.
Mana Needed
({1} magic symbol) ({G} magic symbol) available.
Steps
Activate
Nissa's first loyalty ability by putting a loyalty counter on it, animating a Forest you control.
Activate the animated Forest by tapping it, adding ({G} magic symbol) .
Nissa triggers, adding ({G} magic symbol) .
Cast
Springheart Nantuko for its bestow cost by paying ({1} magic symbol) ({G} magic symbol) , attaching it to the animated Forest.
Play a land.
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 the Forest it is attached to.
When the Forest token enter the battlefield,
Springheart Nantuko triggers.
Holding priority, activate the Forest 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 the Forest it is attached to.
Repeat from step 6.
Notes
The cost in step 6 can possibly be covered by the land played in step 5 on the first iteration, if the land is a Forest that enters untapped. This would make the starting cost of the combo ({0} magic symbol) .