You control an artifact that can tap to produce at least ({U} magic symbol) .
Master Transmuter does not have summoning sickness.
Steps
Activate any artifact you control by tapping it, adding at least ({U} magic symbol) .
Activate Master Transmuter by paying ({U} magic symbol) , tapping it and returning Myr Battlesphere from the battlefield to your hand, putting Myr Battlesphere from your hand onto the battlefield.
Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
Activate Clock of Omens twice by tapping four Myr tokens, untapping the mana-producing artifact and Master Transmuter.