Ruthless Technomancer, Urza, Lord High Artificer, and Cloudstone Curio

Prerequisites

• Ruthless Technomancer in hand or on the battlefield
• Urza, Lord High Artificer on the battlefield
• Cloudstone Curio on the battlefield
• undefined plus up to an additional available

Steps

1. Cast Urza by paying
2. When Urza enters the battlefield, it and Cloudstone Curio trigger
3. Resolve the Cloudstone Curio trigger, choosing to return Ruthless Technomancer from the battlefield to your hand if its on the battlefield, or nothing otherwise
4. Resolve the Urza trigger, creating a 0/0 Construct artifact creature token
5. Activate Urza's first ability by tapping the Construct, adding
6. Cast Ruthless Technomancer by paying
7. When Ruthless Technomancer enters the battlefield, it and Cloudstone Curio trigger
8. Resolve the Ruthless Technomancer trigger, causing you to sacrifice the Construct and create a number of Treasure tokens equal to its power
9. Holding priority, activate Urza's first ability by tapping a Treasure, adding
10. Repeat step 9 until you have total available or until you have one untapped Treasure remaining
11. Resolve the Cloudstone Curio trigger, returning Urza from the battlefield to your hand
12. Activate a Treasure by tapping and sacrificing it, adding
13. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Exile your library
• Infinite Treasure tokens
• Cast all cards in your library without paying their mana costs