Confidence:StrongSolidPlausibleTentativeSpeculative

• The Great Goblin

  1B/RB/R

  Legendary Creature — Goblin NobleBR

  Both cards trigger when a counter is placed — they fire together.
• All Will Be One

  3RR

  EnchantmentR

  Both cards trigger when a counter is placed — they fire together.
• Rings of Brighthearth

  3

  ArtifactC

  Plague Boiler has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.
• Kurkesh, Onakke Ancient

  2RR

  Legendary Creature — Ogre SpiritR

  Plague Boiler has activated abilities that aren't mana abilities, fueling Kurkesh, Onakke Ancient's activation-trigger.