Leonardo, Sewer Samurai + Solemnity + Yahenni, Undying Partisan + Kobolds of Kher Keep

Leonardo, Sewer Samurai

Solemnity

Yahenni, Undying Partisan

Kobolds of Kher Keep

How it works

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

This ingenious loop turns the humble Kobolds of Kher Keep into an infinite sacrifice engine by exploiting a clever rules interaction. While Leonardo, Sewer Samurai normally brands creatures cast from your graveyard with a finality counter, Solemnity’s absolute static blanket prevents any counters from ever landing on them. This means you can continually sacrifice your free Kobolds of Kher Keep to fuel Yahenni, Undying Partisan's sacrifice ability, and then immediately recast them from the graveyard over and over again without penalty.