Eternal Scourge + Young Deathclaws + Crystalline Crawler + Shilgengar, Sire of Famine + The Earth Crystal

Eternal Scourge

Young Deathclaws

Crystalline Crawler

Shilgengar, Sire of Famine

The Earth Crystal

How it works

1. Activate Eternal Scourge's scavenge ability, granted to it by Young Deathclaws, by paying 3 and exiling Eternal Scourge from your graveyard, putting six +1/+1 counters on Crystalline Crawler due to The Earth Crystal.
2. Activate Crystalline Crawler six times by removing six +1/+1 counters from it, adding 6.
3. Cast Eternal Scourge from exile by paying 3.
4. Activate Shilgengar by sacrificing Eternal Scourge.
5. Repeat.