Leonardo, Sewer Samurai + Solemnity + Blasting Station + Crimson Kobolds

Leonardo, Sewer Samurai

Solemnity

Blasting Station

Crimson Kobolds

How it works

1. Activate Blasting Station by tapping it and sacrificing Crimson Kobolds.
2. Cast Crimson Kobolds from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. When Crimson Kobolds enters, Blasting Station triggers, untapping Blasting Station.
4. Repeat.

This clever loop relies on Solemnity to completely bypass Leonardo, Sewer Samurai's finality counter restriction, allowing you to cast Crimson Kobolds from your graveyard over and over again for zero mana. As each free creature enters the battlefield, Blasting Station's triggered ability untaps itself to ready up for the next sacrifice. You can then endlessly tap Blasting Station to sacrifice those same Crimson Kobolds, turning a humble 0-mana creature into an endless barrage of damage and sacrifice triggers.