Coretapper and SIlas Renn do not have summoning sickness.
An opponent is unable to block and kill Silas Renn.
({2} magic symbol) each turn available.
Steps
Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
Activate Coretapper's second ability by sacrificing it, putting two charge counters 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.
Move to your combat phase, and deal combat damage to an opponent with Silas Renn.
Silas Renn triggers, allowing you to cast Coretapper from your graveyard this turn.
Cast Coretapper from your graveyard by paying ({2} magic symbol) .