Plague Boiler - Ravnica: City of Guilds - 269

Artifact

Mana Cost: {3}

At the beginning of your upkeep, put a plague counter on this artifact.
{1}{B}{G}: Put a plague counter on this artifact or remove a plague counter from it.
When this artifact has three or more plague counters on it, sacrifice it. If you do, destroy all nonland permanents.

Rare · Ravnica: City of Guilds · #269 (RAV)

Illustrated by Mark Tedin