Leonardo, Sewer Samurai + Tatterkite + Ravenous Intruder + Rakdos, Lord of Riots

Leonardo, Sewer Samurai

Tatterkite

Ravenous Intruder

Rakdos, Lord of Riots

How it works

1. Cast Tatterkite from your graveyard by paying 0 due to Rakdos. It won't enter with a finality counter on it due to its static ability.
2. Activate Ravenous Intruder by sacrificing Tatterkite.
3. Repeat.

This clever loop turns the graveyard into a virtually bottomless engine by relying on Rakdos, Lord of Riots to slash creature spell costs down to zero after an opponent loses life. Leonardo, Sewer Samurai then opens the gate to recast those creatures right out of your graveyard, while Tatterkite's built-in immunity to counters ingeniously bypasses the finality counters that Leonardo would normally stamp on them. Finally, Ravenous Intruder acts as the sacrificial altar that sends Tatterkite straight back to the graveyard to feed the loop, churning out infinitely large stats and an endless cascade of triggers.