When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
Activate Squandered Resources by sacrificing Stonework Puma.
When Stonework Puma dies, Haru triggers, returning Stonework Puma from your graveyard to the battlefield tapped.
When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
Resolve the Squandered Resources ability.
Repeat from step 3.
This clever loop hinges on Toph, the First Metalbender transforming your nontoken artifacts into lands, turning Stonework Puma into a legal target for Haru, Hidden Talent's earthbend ability as soon as it enters the battlefield. Once the Puma is a land, you can immediately sacrifice it to Squandered Resources to generate mana. Because Toph's land-animation effect grants a safety net—returning the land to the battlefield tapped when it dies or is exiled—the resulting death trigger lets Haru recur the Puma right back onto the battlefield, ready to restart the cycle and churn out infinite sacrifice and landfall triggers.