Confidence:StrongSolidPlausibleTentativeSpeculative

• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Emergent Haunting's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Shifting Woodland

  LandG

  Graveyard copier: one card stocks the graveyard (mill, surveil, dredge) and the other can repeatedly become a copy of a card that's there, borrowing its abilities without recasting it — the Shifting Woodland + Aftermath Analyst shape.
• Rings of Brighthearth

  3

  ArtifactC

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