Sharuum the Hegemon + Coretapper + Magistrate's Scepter + The Mind Stone

Sharuum the Hegemon

Coretapper

Magistrate's Scepter

The Mind Stone

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. At the beginning of your end step, The Mind Stone triggers, blinking Sharuum.
5. When Sharuum enters the battlefield, it triggers, returning Coretapper from your graveyard to the battlefield.
6. Repeat each turn.