Time Sieve + Myr Battlesphere + Sword of Light and Shadow

Time Sieve

Myr Battlesphere

Sword of Light and Shadow

How it works

1. Deal combat damage to an opponent using the creature that has Sword of Light and Shadow attached.
2. Sword of Light and Shadow triggers, causing you to gain three life and return Myr Battlesphere from your graveyard to your hand.
3. Cast Myr Battlesphere by paying 7.
4. When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr creature tokens.
5. 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.
6. Repeat each turn.