Time Sieve + Myr Battlesphere + Terror of Towashi

Time Sieve

Myr Battlesphere

Terror of Towashi

How it works

1. Declare Terror of Towashi as an attacker.
2. Terror of Towashi triggers, causing you to pay 3 to return Myr Battlesphere from your graveyard to the battlefield.
3. When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
4. Activate Time Sieve by tapping it, sacrificing Myr Battlesphere and sacrificing the four Myr tokens, causing you to take an extra turn after this one.
5. Repeat each turn.