Wingrattle Scarecrow + Luminous Broodmoth + Krark-Clan Grunt

Wingrattle Scarecrow

Luminous Broodmoth

Krark-Clan Grunt

How it works

1. Activate Krark-Clan Grunt by sacrificing Wingrattle Scarecrow.
2. When Wingrattle Scarecrow dies, its persist ability triggers if it didn't have a -1/-1 counter, and Luminous Broodmoth triggers if Wingrattle Scarecrow didn't have flying.
3. Resolve the persist trigger, if applicable, returning Wingrattle Scarecrow from your graveyard to the battlefield with either a -1/-1 counter on it.
4. Resolve the Luminous Broodmoth trigger, if applicable, returning Wingrattle Scarecrow 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.