Activate Woe Strider by sacrificing Reassembling Skeleton.
When Reassembling Skeleton dies, Pitiless Plunderer and Totentanz trigger, creating a creature token and a Treasure token.
Resolve the Woe Strider ability.
Activate Woe Strider by sacrificing the creature token.
When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Woe Strider ability.
Activate the Treasures by tapping and sacrificing them, adding 1.
Activate Reassembling Skeleton by paying 1, returning it from your graveyard to the battlefield.
Repeat.
This elegant loop transforms a humble skeleton into a relentless engine of death and discovery. Woe Strider acts as the ultimate sacrifice outlet, letting you fling Reassembling Skeleton into the graveyard while smoothing your draws with its scry ability. Behind the scenes, Pitiless Plunderer and Totentanz, Swarm Piper turn every one of those demises into raw material: Pitiless Plunderer converts each death into a mana-producing Treasure, while Totentanz, Swarm Piper provides an extra creature token to feed the altar whenever a nontoken falls. The mana from the Treasures then funds Reassembling Skeleton's return from the graveyard, allowing the entire sequence to repeat indefinitely.