Corridor Monitor + Retraction Helix + Urza, Lord High Artificer + Voyager Quickwelder

Mana needed: {U}{U}

WU identity

Commander legal

The 4 combo pieces

How to execute it

  1. Cast Retraction Helix by paying {U}, targeting a creature you control that doesn't have summoning sickness.
  2. Cast Corridor Monitor by paying {U} due to Voyager Quickwelder.
  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 {U}.
  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.

What the combo produces