({U} 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 Pemmin's Aura's first ability by paying ({U} magic symbol) , untapping Coretapper.
Repeat from step 1 one additional time.
Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
Activate Magistrate's Scepter's second ability by tapping and removing three charge counters from it, causing you to take an extra turn after this one.