Urtet, Remnant of Memnarch | Equilibrium | Urza's Incubator

(and one other card)

All permanents on the battlefield.
"Myr" chosen with
Urza's Incubator.
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.

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
Urza's first ability by tapping the Myr token, adding ({U} 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.
You may then tap the Myrs using
Urza's first ability, and use the mana to activate
Urza's second ability any number of times.