At the beginning of your upkeep, Debtors' Knell triggers, returning Myr Battlesphere from your graveyard to the battlefield.
Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
Activate Time Sieve by tapping it, sacrificing Myr Battlesphere and the four Myr tokens, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Time Sieve

Myr Battlesphere

Debtors' Knell

At the beginning of your upkeep, Debtors' Knell triggers, returning Coretapper from your graveyard to the battlefield.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Coretapper.
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.
Repeat each turn.

Coretapper

Magistrate's Scepter

Lightning Greaves

At the beginning of your upkeep, Debtors' Knell triggers, returning Coretapper from your graveyard to the battlefield.
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.
Repeat each turn.

Combos with "Debtors' Knell"