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

Alesha, Who Smiles at Death

Crystalline Crawler

Aggravated Assault

Arcbound Overseer

Megatog

How it works

1. Activate Crystalline Crawler's second ability by tapping it, putting a +1/+1 counter on it.
2. Activate Megatog by sacrificing Arcbound Overseer.
3. When Arcbound Overseer dies, it triggers, putting its +1/+1 counters on Crystalline Crawler.
4. Resolve the Megatog 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 loop centers around Crystalline Crawler as a versatile mana engine, filtering the modular counters left behind by Arcbound Overseer—which is repeatedly sacrificed to Megatog and resurrected by Alesha, Who Smiles at Death—into the exact colors needed. Every time Alesha brings back the Overseer, its modular 6 ability stocks up the Crawler with counters, which are then stripped for mana to feed Aggravated Assault. This grants the endless combat phases required to swing with Alesha over and over again, sustaining an infinitely repeating engine of death and rebirth.