Dawnsire, Sunstar Dreadnought + Vigor + Crystalline Crawler + Najeela, the Blade-Blossom

Dawnsire, Sunstar Dreadnought

Vigor

Crystalline Crawler

Najeela, the Blade-Blossom

How it works

1. Declare any creature as an attacker, triggering Najeela if the creature was a Warrior and Dawnsire.
2. Resolve the Najeela trigger, if applicable, creating a 1/1 Warrior creature token that is tapped and attacking.
3. Resolve the Dawnsire trigger, attempting to deal 100 damage to Crystalline Crawler, which will result in 100 +1/+1 counters being placed on it instead due to Vigor.
4. Holding priority, activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding .
5. Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and causing you to get an additional combat phase after this one.
6. Repeat each combat phase.

This dazzling loop turns Dawnsire, Sunstar Dreadnought's massive attack trigger into a perpetual engine by utilizing Vigor to redirect that enormous blow away from Crystalline Crawler, instead converting the prevented damage into a mountain of +1/+1 counters. Crystalline Crawler then happily cashes in those newly minted counters for the exact five-color mana requirement needed to fund Najeela, the Blade-Blossom's combat-extending activation. With Najeela granting infinite additional combat phases and churning out endless attacking Warrior tokens, every piece of the puzzle locks into place to keep the assault rolling indefinitely.