Kenrith, the Returned King + Archaeomancer + Temporal Manipulation + Ashnod's Altar

Kenrith, the Returned King

Archaeomancer

Temporal Manipulation

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 Temporal Manipulation from your graveyard to your hand.
4. Cast Temporal Manipulation by paying 3, causing you to take an extra turn after this one.
5. Repeat.