Prototype Portal + Ugin's Nexus + Umbral Collar Zealot

Mana needed: {5} each turn

B identity

Commander legal

The 3 combo pieces

• Prototype Portal
• Ugin's Nexus
• Umbral Collar Zealot

How to execute it

1. Activate Prototype Portal by paying {5} and tapping it, creating a token copy of Ugin's Nexus.
2. Activate Umbral Collar Zealot by acrificing the Ugin's Nexus token.
3. The Ugin's Nexus token is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
4. Resolve the Umbral Collar Zealot ability
5. Repeat each turn.

What the combo produces

• Infinite turns
• Lock