The Thirteenth Doctor + Squee, the Immortal + Crystalline Crawler + Phyrexian Altar + Branching Evolution

The Thirteenth Doctor

Squee, the Immortal

Crystalline Crawler

Phyrexian Altar

Branching Evolution

How it works

1. Activate Phyrexian Altar by sacrificing Squee, adding .
2. Cast Squee from your graveyard by paying 1.
3. The Thirteenth Doctor's first ability triggers, putting two +1/+1 counters on Crystalline Crawler.
4. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding 1.
5. Repeat.

This clever loop turns Squee, the Immortal into an endlessly recurring sacrifice engine by letting you repeatedly cast him straight from your graveyard after feeding him to Phyrexian Altar. The real magic happens because casting Squee from exile triggers The Thirteenth Doctor, who places a +1/+1 counter on Crystalline Crawler—an influx that Branching Evolution immediately doubles to fuel the Crawler's mana-producing ability. By siphoning mana from Crystalline Crawler and the altar to pay for Squee's repeated resurrections, you generate an endless storm of creature entries, sacrifices, and deaths.