Urza, Lord High Artificer + Corridor Monitor + Banishing Knack + Birgi, God of Storytelling // Harnfel, Horn of Bounty

Urza, Lord High Artificer

Corridor Monitor

Banishing Knack

Birgi, God of Storytelling // Harnfel, Horn of Bounty

How it works

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