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 it and removing three charge counters from it, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Bringer of the White Dawn triggers, returning Coretapper from your graveyard to the battlefield.
Repeat.

Infinite turns

Bringer of the White Dawn

Coretapper

Magistrate's Scepter

Thousand-Year Elixir

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 it and removing three charge counters from it, causing you to take an extra turn after this one.
Move to your next turn.
At the beginning of your upkeep, Bringer of the White Dawn triggers, returning Coretapper from your graveyard to the battlefield.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Coretapper.
Repeat.

Combos with "Bringer of the White Dawn"