You have a Myr card in hand with mana value two or less that can be cast for ({0} magic symbol) due to Urza's Incubator.
You control a nontoken Myr with mana value two or less that can be cast for ({0} magic symbol) due to Urza's Incubator.
Steps
Cast the Myr with mana value two or less in your hand by paying ({0} magic symbol) due to Urza's Incubator.
Urtet and Equilibrium trigger.
Resolve the Urtet trigger, creating a 1/1 Myr artifact creature token.
Activate Krark-Clan Ironworks by sacrificing the Myr token, adding ({C} magic symbol) ({C} magic symbol) .
Resolve the Equilibrium trigger, causing you to pay ({1} magic symbol) to return the Myr with mana value two or less currently on the battlefield to your hand.
Repeat an arbitrarily large number of times.
At the beginning of your combat phase, Urtet's second ability triggers, untapping all Myr you control.