Kenrith, the Returned King + Archaeomancer + Capture of Jingzhou + Ashnod's Altar

Kenrith, the Returned King

Archaeomancer

Capture of Jingzhou

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Archaeomancer, adding CC.
2. Activate Kenrith's last ability by paying 4, returning Archaeomancer from your graveyard to the battlefield.
3. Archaeomancer enters the battlefield, returning Capture of Jingzhou from your graveyard to your hand.
4. Cast Capture of Jingzhou by paying 3, causing you to take an extra turn after this one.
5. Repeat.