Urtet, Remnant of Memnarch, Equilibrium, Urza's Incubator, and Urza, Lord High Artificer

Prerequisites

• Urtet, Remnant of Memnarch on the battlefield
• Equilibrium on the battlefield
• Urza's Incubator on the battlefield
• Urza, Lord High Artificer 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 Urza's first ability by tapping 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
8. 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

Results

• Cast all cards in your library without paying their mana costs
• Infinite blue mana
• Infinite creature tokens
• Infinite ETB
• Infinite LTB
• Infinite storm count
• Exile your library