Alesha, Who Smiles at Death + Crystalline Crawler + Aggravated Assault + Arcbound Overseer + Bloodflow Connoisseur

Alesha, Who Smiles at Death

Crystalline Crawler

Aggravated Assault

Arcbound Overseer

Bloodflow Connoisseur

How it works

1. Activate Crystalline Crawler's second ability by tapping it, putting a +1/+1 counter on it.
2. Activate Bloodflow Connoisseur by sacrificing Arcbound Overseer.
3. When Arcbound Overseer dies, it triggers, putting its +1/+1 counters on Crystalline Crawler.
4. Resolve the Bloodflow Connoisseur ability.
5. Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding 3.
6. Activate Aggravated Assault by paying 3, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
7. Declare Alesha as an attacker, triggering its ability, targeting Arcbound Overseer.
8. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding W/BW/B.
9. Resolve the Alesha trigger, causing you to pay W/BW/B to return Arcbound Overseer from your graveyard to the battlefield tapped and attacking with six +1/+1 counters on it due to its modular ability.
10. Repeat.

This loop relies on a brilliant cycle of sacrifice, reanimation, and modular power generation to fuel endless combat phases. Bloodflow Connoisseur serves as the sacrificial outlet, sending Arcbound Overseer to the graveyard so its modular 6 ability can trigger and dump a massive pile of +1/+1 counters onto Crystalline Crawler. From there, Crystalline Crawler acts as our engine's battery: you can tap it to grow its counters, then strip those counters away for mana to pay for Aggravated Assault's additional combat steps. Finally, Alesha, Who Smiles at Death sweeps in during combat to pull Arcbound Overseer right back out of the graveyard, making the whole recursive cycle ready to repeat indefinitely.