Medomai the Ageless + Preeminent Captain + Arcane Adaptation + Erratic Portal

Prerequisites

• "Samurai" chosen with Arcane Adaptation.
• Oathkeeper attached to Filigree Familiar.

Steps

1. 1Declare Preeminent Captain as an attacker.
2. 2Preeminent Captain triggers, putting Medomai from your hand onto the battlefield tapped and attacking.
3. 3Deal combat damage with Medomai, causing you to take an extra turn after this one.
4. 4Activate Erratic Portal by paying and tapping it, returning Medomai to your hand.
5. 5Pass the turn.
6. 6Repeat.

Effects

• Infinite turns
• Lock