Time Sieve + Myr Battlesphere + Bilbo, Thief in the Night

Time Sieve

Myr Battlesphere

Bilbo, Thief in the Night

How it works

1. Declare Bilbo as an attacker, triggering its ability, causing you to cast Myr Battlesphere from your graveyard by paying 6.
2. When Myr Battlesphere enters, it triggers, creating four 1/1 Myr creature tokens.
3. 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.
4. Repeat each turn.