Drafna and Coretapper do not have summoning sickness.
({6} magic symbol) ({U} magic symbol) each turn available.
Steps
Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
Activate Drafna's first ability by paying ({1} magic symbol) ({U} magic symbol) , returning Coretapper from the battlefield to your hand.
Cast Coretapper by paying ({2} magic symbol) .
Holding priority, activate Drafna's second ability by paying ({3} magic symbol) and tapping it, copying the Coretapper spell.
Activate the Coretapper token's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter.
Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.