Olivia, Crimson Bride, Medomai the Ageless, and Blasting Station

Prerequisites

• Olivia, Crimson Bride on the battlefield
• Medomai the Ageless on the battlefield
• Blasting Station on the battlefield
• Medomai in your graveyard
• Olivia does not have summoning sickness
• An opponent is unable to block your creatures

Steps

1. Declare Olivia as an attacker, attacking an opponent unable to block your creatures
2. Olivia triggers, returning Medomai from your graveyard to the battlefield tapped and attacking that opponent
3. When Medomai enters the battlefield, Blasting Station triggers, untapping itself
4. Deal combat damage with Medomai, triggering its ability, causing you to take an extra turn after this one
5. Activate Blasting Station by tapping it and sacrificing Medomai, dealing 1 damage to any target
6. Repeat

Results

• Infinite turns