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

Mikaeus, the Unhallowed
Antler Skulkin
Ashnod's Altar

Requires
Mikaeus, the Unhallowed must be on the battlefield. Antler Skulkin must be on the battlefield. Ashnod's Altar must be 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 2, 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.

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