Illuminor Szeras does not have summoning sickness.
Steps
Activate Illuminor Szeras by tapping it and sacrificing Myr Battlesphere, adding seven ({B} magic symbol) .
Activate Reito Sentinel by paying ({3} magic symbol) , putting Myr Battlesphere on the bottom of your library.
Activate Grenzo by paying ({2} magic symbol) , putting Myr Battlesphere from the bottom of your library into your graveyard, then putting it onto the battlefield.
When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
Activate Clock of Omens by tapping Myr Battlesphere and a Myr token, untapping Illuminor Szeras.