Sneak Attack by paying ({R} magic symbol) , putting
Garna from your hand onto the battlefield.
When
Garna enters the battlefield, it and
Blasting Station trigger.
Resolve the
Blasting Station trigger, untapping it.
Holding priority, activate
Blasting Station by tapping it and sacrificing
Garna.
When
Garna dies,
Pitiless Plunderer triggers, creating a Treasure token.
Resolve the
Blasting Station ability.
Resolve the
Garna trigger, returning it from your graveyard to your hand.
Activate the Treasure by tapping and sacrificing it, adding ({R} magic symbol) .
Repeat.
Notes
You can repeat this loop with any number of additional creatures. This will require the desired creatures to either be on the battlefield already, or to be in your hand with an additional ({R} magic symbol) available for each creature. Simply play all other creatures with
Sneak Attack before
Garna, and then make sure to sacrifice them all for ({R} magic symbol) before resolving