Activate Perilous Forays by paying ({1} magic symbol) and sacrificing a creature you control, searching your library for a land card with a basic land type and putting it on the battlefield untapped due to Spelunking.
When the land enters the battlefield, Springheart Nantuko triggers, creating a creature token.
Activate the land by tapping it, adding ({1} magic symbol) .
Repeat.
Results
Put all lands with a basic land type from your library onto the battlefield tapped.