Banishing Knack + Corridor Monitor + Sapphire Medallion + Urza, Lord High Artificer

Mana needed: {U}{U}

U identity

Commander legal

The 4 combo pieces

How to execute it

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

What the combo produces