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

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Living Death in hand
• Ashnod's Altar on the battlefield
• Blood Pet on the battlefield
• Ardent Elementalist on the battlefield
• Blood Pet does not have a +1/+1 counter on it

Steps

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
5. Cast Living Death by paying , 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

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite sacrifice triggers
• Infinite storm count