Luminous Broodmoth + Nardole, Resourceful Cyborg + Krark-Clan Grunt

Luminous Broodmoth

Nardole, Resourceful Cyborg

Krark-Clan Grunt

How it works

1. Activate Krark-Clan Grunt by sacrificing Nardole.
2. When Nardole dies, its undying ability triggers if it didn't have a +1/+1 counter, and Luminous Broodmoth triggers if Nardole didn't have flying.
3. Resolve the undying trigger, if applicable, returning Nardole from your graveyard to the battlefield with either a +1/+1 counter on it.
4. Resolve the Luminous Broodmoth trigger, if applicable, returning Nardole from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard.
5. Resolve the Krark-Clan Grunt ability.
6. Repeat.