Leonardo, Sewer Samurai + Solemnity + Umbral Collar Zealot + Crimson Kobolds

Leonardo, Sewer Samurai

Solemnity

Umbral Collar Zealot

Crimson Kobolds

How it works

1. Activate Umbral Collar Zealot by 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. Repeat.

This clever loop turns zero-mana creatures into an engine of endless iteration by using Leonardo, Sewer Samurai to repeatedly pull them right back out of the graveyard. While Leonardo would normally slap a finality counter on anything cast from the graveyard to exile it upon death, Solemnity shuts that restriction down entirely by making sure no counters can ever be placed on your creatures. With that safety net in place, Umbral Collar Zealot gladly accepts the repeated offering of Crimson Kobolds as sacrifice fuel, surveiling your library to your heart's content while churning out infinite death, sacrifice, and entry triggers.