Eternal Scourge + Young Deathclaws + Crystalline Crawler + Woe Strider + Shang-Chi, Martial Mentor

Eternal Scourge

Young Deathclaws

Crystalline Crawler

Woe Strider

Shang-Chi, Martial Mentor

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 Shang-Chi.
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 Woe Strider by sacrificing Eternal Scourge.
5. Repeat.

This clever loop turns the graveyard into a permanent staging ground by using Young Deathclaws to grant scavenge to Eternal Scourge, allowing it to exile itself from the graveyard to pump Crystalline Crawler. Because Shang-Chi, Martial Mentor doubles any counters placed on your creatures, that single scavenge activation loads Crystalline Crawler with twice as many +1/+1 counters, which you can immediately strip for six mana of any color. That mana pays to recast Eternal Scourge directly from exile, and Woe Strider provides a reliable sacrifice outlet to send the Scourge straight back to the graveyard—triggering scrys along the way—so the cycle can begin anew.