Confidence:StrongSolidPlausibleTentativeSpeculative

• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Fountain of Renewal's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Echoes of Eternity

  3CCC

  Kindred Enchantment — EldraziC

  Echoes of Eternity makes Fountain of Renewal's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Kurkesh, Onakke Ancient

  2RR

  Legendary Creature — Ogre SpiritR

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

  3

  ArtifactC

  Fountain of Renewal has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.