Mikaeus, the Unhallowed, Antler Skulkin, and Ashnod's Altar

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Antler Skulkin on the battlefield
• Ashnod's Altar on the battlefield
• You control a nontoken, non-Human white creature

Steps

1. Activate Ashnod's Altar by sacrificing the nontoken, non-Human white creature, adding
2. When the creature dies, its undying ability triggers, returning it to the battlefield from your graveyard with a +1/+1 counter on it
3. Activate Antler Skulkin by paying , giving the creature persist until end of turn
4. Activate Ashnod's Altar by sacrificing the creature, adding
5. When the creature dies, its persist ability triggers, returning it to the battlefield from your graveyard with a -1/-1 counter on it
6. Repeat

Results

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