Leonardo, Sewer Samurai + Solemnity + Crookshank Kobolds + Yahenni, Undying Partisan

Leonardo, Sewer Samurai

Solemnity

Crookshank Kobolds

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Crookshank Kobolds.
2. Cast Crookshank Kobolds from your graveyard by paying 0. It will not enter with a finality counter on it due to Solemnity.
3. Repeat.

This ingenious engine transforms the humble Crookshank Kobolds into an infinite sacrifice loop by leveraging the graveyard-casting permission of Leonardo, Sewer Samurai. Because Solemnity prevents any counters from being placed on creatures, it completely nullifies the finality counters that Leonardo would normally impose, allowing the Kobolds to return from the graveyard indefinitely. You can feed this free loop directly into Yahenni, Undying Partisan's sacrifice ability to generate infinite death triggers, sacrifice triggers, and storm count without ever running out of fodder.