Pitiless Plunderer | Squee, the Immortal | Yahenni, Undying Partisan

(and one other card)

Activate
Yahenni by sacrificing
Squee.
When
Squee dies,
Pitiless Plunderer and
Skittering Precursor trigger.
Resolve the
Pitiless Plunderer trigger, creating a Treasure token.
Resolve the
Skittering Precursor trigger, creating a creature token.
Resolve the
Yahenni ability.
Activate the creature token by sacrificing it, adding ({C} magic symbol) .
When the creature token dies,
Pitiless Plunderer triggers, creating a Treasure token.
Activate the Treasures by tapping and sacrificing them, adding ({R} magic symbol) ({R} magic symbol) .
Cast
Squee from your graveyard by paying ({1} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Repeat.