When Forsaken Miner dies, Scavenger's Talent's second ability triggers, targeting an opponent, and Pitiless Plunderer triggers.
When you commit that crime, Forsaken Miner triggers, causing you to pay to return it from your graveyard to the battlefield.
Resolve the Scavenger's Talent trigger, causing an opponent to mill two cards.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Yahenni ability.
Activate the Treasure by tapping and sacrificing it, adding .
Repeat.
This loop turns a simple sacrifice into a self-sustaining engine by letting Yahenni, Undying Partisan repeatedly dispatch Forsaken Miner to the graveyard. Every time Forsaken Miner hits the graveyard, Pitiless Plunderer steps in to generate a fresh Treasure token, which you can immediately sacrifice to supply the black mana required to trigger Forsaken Miner's crime-based resurrection clause. Meanwhile, Scavenger's Talent quietly accelerates the whole process by churning out Food tokens whenever your creatures die, turning your endless sacrifices into an escalating mill threat against your opponents.