Leonardo, Sewer Samurai + Solemnity + Woe Strider + Kobolds of Kher Keep

Leonardo, Sewer Samurai

Solemnity

Woe Strider

Kobolds of Kher Keep

How it works

1. Activate Woe Strider 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 clever loop relies on Solemnity to completely bypass the downside of Leonardo, Sewer Samurai, whose static ability lets you cast 1-power or 1-toughness creatures like Kobolds of Kher Keep directly from your graveyard. Normally, Leonardo would place a finality counter on the Kobolds as they enter, exiling them upon death, but Solemnity's preventative enchantment effect stops those counters from ever being placed. With the Kobolds returning freely for zero mana, you can feed them repeatedly to Woe Strider's sacrifice ability to churn through your deck with infinite scry triggers while generating an endless stream of leaves-the-battlefield, enters-the-battlefield, and death events.