Antler Skulkin, Cathars' Crusade, and Ashnod's Altar

Prerequisites

• Antler Skulkin on the battlefield
• Cathars' Crusade on the battlefield
• Ashnod's Altar on the battlefield
• You control a nontoken white creature that does not have a -1/-1 counter on it
• available

Steps

1. Activate Antler Skulkin by paying , giving the nontoken white creature persist until end of turn
2. Activate Ashnod's Altar by sacrificing the white creature, adding
3. The creature dies, triggering its persist ability, returining it from your graveyard to the battlefield with a -1/-1 counter on it
4. The creature enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
5. Repeat

Results

• Infinite +1/+1 counters
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers