Antler Skulkin, Ashnod's Altar, and Arcbound Prototype

Prerequisites

• Antler Skulkin on the battlefield
• Ashnod's Altar on the battlefield
• Arcbound Prototype on the battlefield
• available

Steps

1. Activate Antler Skulkin by paying , giving Arcbound Prototype persist until end of turn
2. Activate Ashnod's Altar by sacrificing Arcbound Prototype, adding
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

Results

• Infinite +1/+1 counters on each artifact creature you control except Arcbound Prototype
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers