Antler Skulkin, Ashnod's Altar, and Phantom Flock

Prerequisites

• Antler Skulkin on the battlefield
• Ashnod's Altar on the battlefield
• Phantom Flock on the battlefield
• Phantom Flock does not have a -1/-1 counter on it
• available

Steps

1. Activate Antler Skulkin by paying , giving Phantom Flock persist until end of turn
2. Activate Ashnod's Altar by sacrificing Phantom Flock, adding
3. When Phantom Flock dies, its persist ability triggers, returning it to the battlefield from your graveyard with two +1/+1 counters on it due to its first ability
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers