Tuktuk the Explorer + Nim Deathmantle + Ashnod's Altar

Tuktuk the Explorer

Nim Deathmantle

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Tuktuk the Explorer, adding CC.
2. Tuktuk the Explorer dies, triggering itself and Nim Deathmantle.
3. Resolve the Tuktuk the Explorer trigger, creating a 5/5 Tuktuk the Returned artifact creature token.
4. Activate Ashnod's Altar by sacrificing Tuktuk the Returned, adding CC.
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return Tuktuk the Explorer from your graveyard to the battlefield, and attach Nim Deathmantle to it.
6. Repeat.