All permanents on the battlefield (Sculpting Steel as a copy of Thornbite Staff).
Either Sculpting Steel or Thornbite Staff attached to Reckoner Bankbuster, with the other attached to Coretapper.
Reckoner Bankbuster and Coretapper do not have summoning sickness.
Reckoner Bankbuster has exactly one charge counter on it.
({2} magic symbol) available.
Steps
Activate Reckoner Bankbuster by paying ({2} magic symbol) , tapping it, and removing a charge counter from it, causing you to draw a card, create a Treasure artifact token and create a 1/1 Pilot creature token.
Activate Coretapper's first ability by tapping it, putting a charge counter on Reckoner Bankbuster.
Activate Ashnod's Altar by sacrificing the Pilot token, adding ({C} magic symbol) ({C} magic symbol) .
When the Pilot dies, Coretapper and Reckoner Bankbuster triggers, untapping themselves.