Urza, Lord High Artificer + Corridor Monitor + Retraction Helix + Shuri, Wakandan Inventor

Urza, Lord High Artificer

Corridor Monitor

Retraction Helix

Shuri, Wakandan Inventor

How it works

1. Cast Retraction Helix by paying , targeting a creature you control that doesn't have summoning sickness.
2. Cast Corridor Monitor by paying due to Shuri.
3. When Corridor Monitor enters, it triggers, untapping the creature targeted by Retraction Helix.
4. Activate Urza's first ability by tapping Corridor Monitor, adding .
5. Activate the creature targeted by Retraction Helix by tapping it, returning Corridor Monitor from the battlefield to your hand.
6. Repeat from step 2.

This clever loop lets you recast Corridor Monitor indefinitely to generate infinite storm count and endless enters-and-leaves-the-battlefield triggers. You start by granting a creature the ability to bounce permanents with Retraction Helix, which then recycles Corridor Monitor back to your hand each time it arrives. Meanwhile, Urza, Lord High Artificer acts as your mana engine by tapping the incoming Monitor for blue mana, while Shuri, Wakandan Inventor quietly reduces the artifact's casting cost so you can keep replaying it without running out of resources.