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

Kenrith, the Returned King

Eternal Witness

Temporal Manipulation

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Eternal Witness, adding CC.
2. Activate Kenrith's last ability by paying 4, returning Eternal Witness from your graveyard to the battlefield.
3. Eternal Witness 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.