Activate Planar Bridge by paying ({8} magic symbol) and tapping it, causing you to search your library for Myr Battlesphere and put it onto the battlefield.
When Myr Battlesphere enters the battlefield, it triggers, 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.
Activate Soldevi Digger by paying ({2} magic symbol) , putting Myr Battlesphere on the bottom of your library from your graveyard.