Requires

Urtet, Remnant of Memnarch must be on the battlefield. Equilibrium must be on the battlefield. Urza's Incubator must be on the battlefield. Krark-Clan Ironworks must be 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 due to Urza's Incubator. You control a nontoken Myr with mana value two or less that can be cast for due to Urza's Incubator.

Steps

1. Cast the Myr with mana value two or less in your hand by paying 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 Krark-Clan Ironworks by sacrificing the Myr token, adding .
5. Resolve the Equilibrium trigger, causing you to pay to return the Myr with mana value two or less currently on the battlefield to your hand.
6. Repeat an arbitrarily large number of times.
7. At the beginning of your combat phase, Urtet's second ability triggers, untapping all Myr you control.

Results