Arcane Adaptation + Crystal Shard + Medomai the Ageless + Preeminent Captain

Mana needed: {U} each turn

WU identity

Commander legal

The 4 combo pieces

• Arcane Adaptation
• Crystal Shard
• Medomai the Ageless
• Preeminent Captain

What must be in place

Medomai in hand.Preeminent Captain does not have summoning sickness.
"Sphinx" chosen with Arcane Adaptation.
Opponents can not block and kill Preeminent Captain and Medomai.

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 Crystal Shard by paying {U} and tapping it, returning Medomai to your hand.
5. Pass the turn.
6. Repeat.

What the combo produces

• Infinite turns
• Lock