Mikaeus, the Unhallowed + Rise of the Dark Realms + Ashnod's Altar + Blood Pet + Ardent Elementalist

Mikaeus, the Unhallowed

Rise of the Dark Realms

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 another nontoken non-Human creature, adding CCCC.
5. When the non-Human creature dies, its undying ability triggers, returning it to the battlefield from your graveyard with a +1/+1 counter on it.
6. Activate Ashnod's Altar twice by sacrificing Mikaeus and the non-Human creature, adding CCCC.
7. Cast Rise of the Dark Realms by paying 7, putting all creature cards from all graveyards onto the battlefield under your control.
8. When Ardent Elementalist enters the battlefield, it triggers, returning Living Death to your hand from your graveyard.
9. Repeat.