Mikaeus, the Unhallowed + Luminous Broodmoth + Ashnod's Altar

Mikaeus, the Unhallowed

Luminous Broodmoth

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing the creature, adding CC.
2. When the creature dies, its undying ability triggers if it didn't have a +1/+1 counter, and Luminous Broodmoth triggers if the creature didn't have flying.
3. Resolve the undying trigger, if applicable, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
4. Resolve the Luminous Broodmoth trigger, if applicable, returning the creature from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard.
5. Repeat.