Dread Slaver, Flayer of the Hatebound, Mikaeus, the Unhallowed, and Ashnod's Altar

Prerequisites

• Dread Slaver on the battlefield
• Flayer of the Hatebound on the battlefield
• Mikaeus, the Unhallowed on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Dread Slaver, adding
2. When Dread Slaver dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Dread Slaver enters the battlefield, Flayer of the Hatebound triggers, causing Dread Slaver to deal damage to itself equal to its power
4. Activate Ashnod's Altar by sacrificing Dread Slaver, adding
5. Dread Slaver triggers, returning itself from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers