Leonardo, Sewer Samurai + Solemnity + Carrion Feeder + Kobolds of Kher Keep

Leonardo, Sewer Samurai

Solemnity

Carrion Feeder

Kobolds of Kher Keep

How it works

1. Activate Carrion Feeder 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 loop is a masterclass in turning a weakness into an infinite engine, powered entirely by graveyard recursion and replacement-effect prevention. With Solemnity sitting on the battlefield, its passive ability completely blocks counters from being put on any artifacts, creatures, enchantments, or lands—which elegantly neuters Leonardo, Sewer Samurai's drawback of applying finality counters when casting creatures with power or toughness 1 or less from the graveyard. This allows you to repeatedly cast free creature spells like Kobolds of Kher Keep over and over again. Once the Kobolds hit the board, you feed them to Carrion Feeder, which happily grows infinitely large while generating endless sacrifice, death, and trigger counts.