Bringer of the White Dawn + Coretapper + Magistrate's Scepter + Thousand-Year Elixir

Bringer of the White Dawn

Coretapper

Magistrate's Scepter

Thousand-Year Elixir

How it works

1. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
2. Activate Coretapper's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter.
3. 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.
4. Move to your next turn.
5. At the beginning of your upkeep, Bringer of the White Dawn triggers, returning Coretapper from your graveyard to the battlefield.
6. Repeat.