Antler Skulkin + Krark-Clan Ironworks + Arcbound Prototype

Antler Skulkin

Krark-Clan Ironworks

Arcbound Prototype

How it works

1. Activate Antler Skulkin by paying 2, giving Arcbound Prototype persist until end of turn.
2. Activate Krark-Clan Ironworks by sacrificing Arcbound Prototype, adding CC.
3. When Arcbound Prototype dies, its modular and persist abilities trigger.
4. Resolve the modular trigger, putting all +1/+1 counters on Arcbound Prototype onto another artifact creature you control.
5. Resolve the persist trigger, returning Arcbound Prototype from your graveyard to the battlefield with one +1/+1 counter on it due to its modular ability.
6. Repeat.