Nim Deathmantle + Krark-Clan Ironworks + Voldaren Bloodcaster // Bloodbat Summoner

Nim Deathmantle

Krark-Clan Ironworks

Voldaren Bloodcaster // Bloodbat Summoner

How it works

1. Activate Krark-Clan Ironworks by sacrificing a nontoken artifact creature, adding CC.
2. When the creature dies, Voldaren Bloodcaster and Nim Deathmantle trigger.
3. Resolve the Voldaren Bloodcaster trigger, creating a Blood artifact token.
4. Activate Krark-Clan Ironworks by sacrificing the Blood token, adding CC.
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return the artifact creature from your graveyard to the battlefield, and attach Nim Deathmantle to it.
6. Repeat.