Leonardo, Sewer Samurai + Solemnity + Memnite + Bloodthrone Vampire

Leonardo, Sewer Samurai

Solemnity

Memnite

Bloodthrone Vampire

How it works

1. Activate Bloodthrone Vampire by sacrificing Memnite.
2. Cast Memnite 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 the graveyard into an endless supply of free sacrifices by leaning entirely on Solemnity to bypass Leonardo, Sewer Samurai's usual downside. While Leonardo ordinarily saddles creatures cast from your graveyard with a finality counter, Solemnity's static ability completely prevents any counters from ever being placed on creatures. This allows you to repeatedly cast Memnite for free from your graveyard over and over again, feeding it directly to Bloodthrone Vampire to churn out infinite sacrifice triggers, death triggers, and an arbitrarily large vampire until end of turn.