Urtet, Remnant of Memnarch + Equilibrium + Urza's Incubator + Phyrexian Altar

Urtet, Remnant of Memnarch

Equilibrium

Urza's Incubator

Phyrexian Altar

How it works

1. Cast the Myr with mana value two or less in your hand by paying 0 due to Urza's Incubator.
2. Urtet and Equilibrium trigger.
3. Resolve the Urtet trigger, creating a 1/1 Myr artifact creature token.
4. Activate Phyrexian Altar by sacrificing the Myr token, adding 1.
5. Resolve the Equilibrium trigger, causing you to pay 1 to return the Myr with mana value two or less currently on the battlefield to your hand.
6. Repeat.