Requires

Elenda, the Dusk Rose must be on the battlefield. Antler Skulkin must be on the battlefield. Ashnod's Altar must be on the battlefield. Legion Lieutenant must be on the battlefield. Elenda does not have a -1/-1 counter on it. Mana needed:

Steps

1. Activate Antler Skulkin by paying , giving Elenda persist until end of turn.
2. Activate Ashnod's Altar by sacrificing Elenda, adding .
3. Elenda dies, triggering its second ability and its persist ability.
4. Resolve Elenda's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve the second Elenda trigger, creating a number of 1/1 Vampire creature tokens equal to Elenda's power.
6. Activate Ashnod's Altar by sacrificing a Vampire token, adding .
7. The Vampire dies, triggering Elenda's first ability, putting a +1/+1 counter on it.
8. Repeat.

Results