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

WU identity

Commander legal

The 4 combo pieces

What must be in place

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

How to execute it

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

What the combo produces