Skittering Precursor + Sword of the Meek + Street Riot + Umbral Collar Zealot

Skittering Precursor

Sword of the Meek

Street Riot

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Sword of the Meek.
2. Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
3. When the Eldrazi Spawn enters the battlefield as a 1/1 due to Street Riot, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn.
4. Resolve the Umbral Collar Zealot ability
5. Repeat.

This clever loop turns the graveyard and battlefield into a perpetual motion machine by exploiting a clever size manipulation: when you use Umbral Collar Zealot to sacrifice Sword of the Meek, Skittering Precursor triggers to spawn a colorless Eldrazi Spawn. Because Street Riot passively grants your creatures +1/+0 during your turn, that newly created 0/1 token enters as a 1/1, which immediately satisfies Sword of the Meek's resurrection condition and automatically attaches the sword right back to it. This lets you endlessly feed the Zealot to churn through your library with infinite surveil triggers, generate infinite colorless mana by sacrificing the tokens, and bury your opponents under an unstoppable tide of sacrifices and triggers.