Cordial Vampire, Antler Skulkin, and Ashnod's Altar

Prerequisites

• Cordial Vampire on the battlefield
• Antler Skulkin on the battlefield
• Ashnod's Altar on the battlefield
• You control a white nontoken Vampire with toughness two or greater that does not have a -1/-1 counter on it
• available

Steps

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

Results

• Infinite +1/+1 counters on each Vampire you control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers