Mikaeus, the Unhallowed + Living Death + Ashnod's Altar + Blood Pet + Ardent Elementalist

Mikaeus, the Unhallowed

Living Death

Ashnod's Altar

Blood Pet

Ardent Elementalist

How it works

1. Activate Blood Pet by sacrificing it, adding .
2. When Blood Pet dies, its undying ability triggers, returning it to the battlefield from your graveyard with a +1/+1 counter on it.
3. Activate Blood Pet by sacrificing it, adding .
4. Activate Ashnod's Altar twice by sacrificing Ardent Elementalist and Mikaeus, adding CCCC.
5. Cast Living Death by paying 3, causing each player to exile all creature cards in their graveyards, sacrifice all creatures they control, then put all cards exiled this way onto the battlefield.
6. When Ardent Elementalist enters the battlefield, it triggers, returning Living Death to your hand from your graveyard.
7. Repeat.