Elesh Norn, Grand Cenobite + Grim Poppet + Painter's Servant + Antler Skulkin + Krark-Clan Ironworks

Elesh Norn, Grand Cenobite

Grim Poppet

Painter's Servant

Antler Skulkin

Krark-Clan Ironworks

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, targeting another creature.
2. Repeat until Grim Poppet has no -1/-1 counters on it.
3. Activate Antler Skulkin by paying 2, giving Grim Poppet persist until end of turn.
4. Activate Krark-Clan Ironworks by sacrificing Grim Poppet, adding CC.
5. Grim Poppet dies, triggering its persist ability, returning it from your graveyard to the battlefield with a total of four -1/-1 counters on it.
6. Repeat.