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

Alesha, Who Smiles at Death

Crystalline Crawler

Aggravated Assault

Arcbound Overseer

Sarcatog

How it works

1. Activate Crystalline Crawler's second ability by tapping it, putting a +1/+1 counter on it.
2. Activate Sarcatog by sacrificing Arcbound Overseer.
3. When Arcbound Overseer dies, it triggers, putting its +1/+1 counters on Crystalline Crawler.
4. Resolve the Sarcatog 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 intricate engine relies on recycling Crystalline Crawler's multi-colored mana production and counter manipulation to fund Aggravated Assault's extra combat phases. Sarcatog acts as the sacrifice outlet for Arcbound Overseer, allowing the Overseer to perish so its modular ability can shift a wealth of +1/+1 counters straight onto the Crawler. Meanwhile, Alesha, Who Smiles at Death takes full advantage of those repeated combat steps to constantly resurrect the Overseer from your graveyard, keeping the counter supply flowing endlessly.