Eternal Scourge + Young Deathclaws + Crystalline Crawler + Carrion Feeder + Doubling Season

Eternal Scourge

Young Deathclaws

Crystalline Crawler

Carrion Feeder

Doubling Season

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 Doubling Season.
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 Carrion Feeder by sacrificing Eternal Scourge.
5. Repeat.

This intricate loop turns a graveyard into an endless engine of growth and sacrifice. Young Deathclaws grants every creature card in your graveyard scavenge equal to its mana cost, allowing you to repeatedly exile Eternal Scourge for a modest investment of mana. Because Doubling Season doubles all counters placed on permanents, the scavenge action places an overwhelming surplus of +1/+1 counters on Crystalline Crawler, which can immediately filter them back into mana of any color. To reset the loop, Carrion Feeder conveniently gobbles up Eternal Scourge from the battlefield, capitalizing on its unique ability to be recast straight out of exile.