Lithatog + Prototype Portal + Ugin's Nexus

Mana needed: {5} each turn

RG identity

Commander legal

The 3 combo pieces

• Lithatog
• Prototype Portal
• Ugin's Nexus

How to execute it

1. Activate Prototype Portal by paying {5} and tapping it, creating a token copy of Ugin's Nexus.
2. Activate Lithatog by sacrificing 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 Lithatog ability, giving it +1/+1 until end of turn.
5. Repeat each turn.

What the combo produces

• Infinite turns
• Lock