Urza, Lord High Artificer + Sewer-veillance Cam + Retraction Helix

Prerequisites

• You control a creature that doesn't have summoning sickness.

Steps

1. 1Cast Retraction Helix by paying , targeting a creature you control that doesn't have summoning sickness.
2. 2Cast Sewer-veillance Cam by paying .
3. 3When Sewer-veillance Cam enters, it triggers, untapping a creature you control.
4. 4Activate Urza's first ability by tapping Sewer-veillance Cam, adding .
5. 5Activate the creature targeted by Retraction Helix by tapping it, returning Sewer-veillance Cam from the battlefield to your hand.
6. 6When Sewer-veillance Cam leaves the battlefield, it triggers, untapping the creature tapped in step 5.
7. 7Repeat from step 2.

Effects

• Cast all spells in your library
• Exile your library
• Infinite blue mana
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of creatures you control