Infinite death triggersInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggers
How it works
Activate Antler Skulkin by paying 2, giving Phantom Flock persist until end of turn.
Activate Ashnod's Altar by sacrificing Phantom Flock, adding CC.
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.